[1.1.x] Reset LCD status to fallbacks (#10467)

* Remove obsolete strings
* Tweak some static consts
* Reset LCD status to fallbacks

When paused, "Print paused..."
When SD printing, the filename
When host printing, "Printing..."
When idle, "MyPrinter ready."

Marlin/ubl_G29.cpp

@@ -621,8 +621,8 @@
 
     #if ENABLED(NEWPANEL)
       lcd_reset_alert_level();
-      LCD_MESSAGEPGM("");
       lcd_quick_feedback(true);
+      lcd_reset_status();
       lcd_external_control = false;
     #endif