Fix bad comparison (#17470)

* Suggested message change

* Fix Bad Comparison

Co-authored-by: Scott Lahteine <github@thinkyhead.com>

Marlin/src/module/tool_change.cpp

     if (new_tool >= EXTRUDERS)
       return invalid_extruder_error(new_tool);
 
-    if (!no_move && !homing_needed()) {
+    if (!no_move && homing_needed()) {
       no_move = true;
       if (DEBUGGING(LEVELING)) DEBUG_ECHOLNPGM("No move (not homed)");
     }