obs-ffmpeg: Fix translation key capitalisation

plugins/obs-ffmpeg/obs-ffmpeg-source.c

@@ -487,7 +487,7 @@ static void ffmpeg_source_update(void *data, obs_data_t *settings)
 static const char *ffmpeg_source_getname(void *unused)
 {
 	UNUSED_PARAMETER(unused);
-	return obs_module_text("FFMpegSource");
+	return obs_module_text("FFmpegSource");
 }
 
 static void restart_hotkey(void *data, obs_hotkey_id id, obs_hotkey_t *hotkey,