Libretro: Do not rumble on startup

There's no need for this.

src/libretro/freej2me_libretro.c

@@ -115,7 +115,7 @@ long joymouseTime = 0; /* countdown to show/hide mouse cursor */
 long joymouseClickedTime = 0; /* Countdown to show/hide the cursor in the clicked state */
 bool joymouseAnalog = false; /* flag - using analog stick for mouse movement */
 int mouseLpre = 0; /* old mouse button state */
-int rumbleTime = 100; /* Rumble duration calculated based on data received from FreeJ2ME-lr.jar */
+int rumbleTime = 0; /* Rumble duration calculated based on data received from FreeJ2ME-lr.jar */
 bool uses_mouse = true;
 bool uses_pointer = false;
 bool booted = false;