Make M220 B / R a standard feature (#20355)

Marlin/src/gcode/config/M220.cpp

@@ -37,11 +37,9 @@
  */
 void GcodeSuite::M220() {
 
-  #if HAS_PRUSA_MMU2
   static int16_t backup_feedrate_percentage = 100;
   if (parser.seen('B')) backup_feedrate_percentage = feedrate_percentage;
   if (parser.seen('R')) feedrate_percentage = backup_feedrate_percentage;
-  #endif
 
   if (parser.seenval('S')) feedrate_percentage = parser.value_int();