Replace the "ok" in M280, M301, M304, M851 with output not including an "ok"

Replace the "ok" in M280, M301, M304, M851 with output not including an "ok"
to avoid senting two "ok"s for a single g-code.

Doing the same for M105 would break the input filters of the hosts.
For M105 the other "ok" is omitted.

Marlin/Marlin_main.cpp

@@ -4749,19 +4749,18 @@ inline void gcode_M226() {
       if (servo_index >= 0 && servo_index < NUM_SERVOS)
         servo[servo_index].move(servo_position);
       else {
-        SERIAL_ECHO_START;
+        SERIAL_ERROR_START;
-        SERIAL_ECHO("Servo ");
+        SERIAL_ERROR("Servo ");
-        SERIAL_ECHO(servo_index);
+        SERIAL_ERROR(servo_index);
-        SERIAL_ECHOLN(" out of range");
+        SERIAL_ERRORLN(" out of range");
       }
     }
     else if (servo_index >= 0) {
-      SERIAL_PROTOCOL(MSG_OK);
+      SERIAL_ECHO_START;
-      SERIAL_PROTOCOL(" Servo ");
+      SERIAL_ECHO(" Servo ");
-      SERIAL_PROTOCOL(servo_index);
+      SERIAL_ECHO(servo_index);
-      SERIAL_PROTOCOL(": ");
+      SERIAL_ECHO(": ");
-      SERIAL_PROTOCOL(servo[servo_index].read());
+      SERIAL_ECHOLN(servo[servo_index].read());
-      SERIAL_EOL;
     }
   }
 
@@ -4812,27 +4811,27 @@ inline void gcode_M226() {
       #endif
 
       updatePID();
-      SERIAL_PROTOCOL(MSG_OK);
+      SERIAL_ECHO_START;
       #if ENABLED(PID_PARAMS_PER_EXTRUDER)
-        SERIAL_PROTOCOL(" e:"); // specify extruder in serial output
+        SERIAL_ECHO(" e:"); // specify extruder in serial output
-        SERIAL_PROTOCOL(e);
+        SERIAL_ECHO(e);
       #endif // PID_PARAMS_PER_EXTRUDER
-      SERIAL_PROTOCOL(" p:");
+      SERIAL_ECHO(" p:");
-      SERIAL_PROTOCOL(PID_PARAM(Kp, e));
+      SERIAL_ECHO(PID_PARAM(Kp, e));
-      SERIAL_PROTOCOL(" i:");
+      SERIAL_ECHO(" i:");
-      SERIAL_PROTOCOL(unscalePID_i(PID_PARAM(Ki, e)));
+      SERIAL_ECHO(unscalePID_i(PID_PARAM(Ki, e)));
-      SERIAL_PROTOCOL(" d:");
+      SERIAL_ECHO(" d:");
-      SERIAL_PROTOCOL(unscalePID_d(PID_PARAM(Kd, e)));
+      SERIAL_ECHO(unscalePID_d(PID_PARAM(Kd, e)));
       #if ENABLED(PID_ADD_EXTRUSION_RATE)
-        SERIAL_PROTOCOL(" c:");
+        SERIAL_ECHO(" c:");
         //Kc does not have scaling applied above, or in resetting defaults
-        SERIAL_PROTOCOL(PID_PARAM(Kc, e));
+        SERIAL_ECHO(PID_PARAM(Kc, e));
       #endif
       SERIAL_EOL;
     }
     else {
-      SERIAL_ECHO_START;
+      SERIAL_ERROR_START;
-      SERIAL_ECHOLN(MSG_INVALID_EXTRUDER);
+      SERIAL_ERRORLN(MSG_INVALID_EXTRUDER);
     }
   }
 
@@ -4846,14 +4845,13 @@ inline void gcode_M226() {
     if (code_seen('D')) bedKd = scalePID_d(code_value());
 
     updatePID();
-    SERIAL_PROTOCOL(MSG_OK);
+    SERIAL_ECHO_START;
-    SERIAL_PROTOCOL(" p:");
+    SERIAL_ECHO(" p:");
-    SERIAL_PROTOCOL(bedKp);
+    SERIAL_ECHO(bedKp);
-    SERIAL_PROTOCOL(" i:");
+    SERIAL_ECHO(" i:");
-    SERIAL_PROTOCOL(unscalePID_i(bedKi));
+    SERIAL_ECHO(unscalePID_i(bedKi));
-    SERIAL_PROTOCOL(" d:");
+    SERIAL_ECHO(" d:");
-    SERIAL_PROTOCOL(unscalePID_d(bedKd));
+    SERIAL_ECHOLN(unscalePID_d(bedKd));
-    SERIAL_EOL;
   }
 
 #endif // PIDTEMPBED
@@ -5285,7 +5283,7 @@ inline void gcode_M503() {
       float value = code_value();
       if (Z_PROBE_OFFSET_RANGE_MIN <= value && value <= Z_PROBE_OFFSET_RANGE_MAX) {
         zprobe_zoffset = value;
-        SERIAL_ECHOPGM(MSG_OK);
+        SERIAL_ECHO(zprobe_zoffset);
       }
       else {
         SERIAL_ECHOPGM(MSG_Z_MIN);