Merge pull request #8607 from benlye/patch-1

[2.0.x] Fix M49 so that it does not hang the terminal console

Marlin/src/gcode/bedlevel/ubl/M49.cpp

@@ -33,8 +33,8 @@
 
 void GcodeSuite::M49() {
   g26_debug_flag ^= true;
-  SERIAL_PROTOCOLPGM("G26 Debug ");
-  serialprintPGM(g26_debug_flag ? PSTR("on.") : PSTR("off."));
+  SERIAL_PROTOCOLPGM("G26 Debug: ");
+  serialprintPGM(g26_debug_flag ? PSTR("On\n") : PSTR("Off\n"));
 }
 
 #endif // G26_MESH_VALIDATION