Apply unknown_position_error elsewhere

Marlin/Marlin_main.cpp

@@ -1834,9 +1834,7 @@ static void unknown_position_error() {
       }
     #endif
     if (!axis_known_position[X_AXIS] || !axis_known_position[Y_AXIS]) {
-      LCD_MESSAGEPGM(MSG_POSITION_UNKNOWN);
+      unknown_position_error();
-      SERIAL_ECHO_START;
-      SERIAL_ECHOLNPGM(MSG_POSITION_UNKNOWN);
       return;
     }
 
@@ -2586,9 +2584,7 @@ inline void gcode_G28() {
               }
             }
             else {
-              LCD_MESSAGEPGM(MSG_POSITION_UNKNOWN);
+              unknown_position_error();
-              SERIAL_ECHO_START;
-              SERIAL_ECHOLNPGM(MSG_POSITION_UNKNOWN);
             }
 
           } // !home_all_axes && homeZ
@@ -2859,9 +2855,7 @@ inline void gcode_G28() {
 
     // Don't allow auto-leveling without homing first
     if (!axis_known_position[X_AXIS] || !axis_known_position[Y_AXIS]) {
-      LCD_MESSAGEPGM(MSG_POSITION_UNKNOWN);
+      unknown_position_error();
-      SERIAL_ECHO_START;
-      SERIAL_ECHOLNPGM(MSG_POSITION_UNKNOWN);
       return;
     }