Changed LCD representation of Z-Offset (#2240)

- Z Offset now shown using two decimal places to better match the
  resolution of the encoder.

Marlin/Conditionals_LulzBot.h

@@ -1768,6 +1768,7 @@
     #define LULZBOT_BABYSTEP_ZPROBE_GFX_OVERLAY
     #define LULZBOT_THIN_OVERLAY_ARROWS
     #define LULZBOT_DISABLE_KILL_BUTTON
+    #define LULZBOT_ZOFFSET_PRECISION ftostr32
 #endif
 
 /* Marlin requires static PSTRs to display on the LCD display, because of this */

Marlin/ultralcd.cpp

@@ -1273,7 +1273,7 @@ void kill_screen(const char* lcd_msg) {
           }
         }
         if (lcdDrawUpdate) {
-          lcd_implementation_drawedit(PSTR(MSG_ZPROBE_ZOFFSET), ftostr43sign(zprobe_zoffset));
+          lcd_implementation_drawedit(PSTR(MSG_ZPROBE_ZOFFSET), LULZBOT_ZOFFSET_PRECISION(zprobe_zoffset));
           #if ENABLED(BABYSTEP_ZPROBE_GFX_OVERLAY)
             _lcd_zoffset_overlay_gfx(zprobe_zoffset);
           #endif