Fix a weird old typo

src/Backends/Platform/GLFW3.cpp

@@ -270,7 +270,7 @@ void Backend_SetCursor(const unsigned char *rgb_pixels, size_t width, size_t hei
 	}
 }
 
-void PlaybackBackend_EnableDragAndDrop(void)
+void Backend_EnableDragAndDrop(void)
 {
 	glfwSetDropCallback(window, DragAndDropCallback);
 }

src/Backends/Platform/Null.cpp

@@ -48,7 +48,7 @@ void Backend_SetCursor(const unsigned char *rgb_pixels, size_t width, size_t hei
 	(void)height;
 }
 
-void PlaybackBackend_EnableDragAndDrop(void)
+void Backend_EnableDragAndDrop(void)
 {
 	
 }

src/Backends/Platform/SDL2.cpp

@@ -161,7 +161,7 @@ void Backend_SetCursor(const unsigned char *rgb_pixels, size_t width, size_t hei
 	}
 }
 
-void PlaybackBackend_EnableDragAndDrop(void)
+void Backend_EnableDragAndDrop(void)
 {
 	SDL_EventState(SDL_DROPFILE, SDL_ENABLE);
 }

src/Backends/Platform/WiiU.cpp

@@ -90,7 +90,7 @@ void Backend_SetCursor(const unsigned char *rgb_pixels, size_t width, size_t hei
 	(void)height;
 }
 
-void PlaybackBackend_EnableDragAndDrop(void)
+void Backend_EnableDragAndDrop(void)
 {
 	
 }

src/Main.cpp

@@ -284,7 +284,7 @@ int main(int argc, char *argv[])
 	}
 
 #ifdef DEBUG_SAVE
-	PlaybackBackend_EnableDragAndDrop();
+	Backend_EnableDragAndDrop();
 #endif
 
 	// Set up window icon