Update Marlin_main.cpp

Remove unnecessary line break from M48 V1 output.

Marlin/Marlin_main.cpp

@@ -5196,9 +5196,9 @@ inline void gcode_M42() {
             SERIAL_PROTOCOLPGM(" range: ");
             SERIAL_PROTOCOL_F(max-min, 3);
           }
-        }
           SERIAL_EOL;
         }
+      }
 
     } // End of probe loop