Use common sc_action in input manager

Now that the scrcpy input events API exposes a sc_action enum, use the
same from the input manager.

app/src/input_manager.c

@@ -3,13 +3,9 @@
 #include <assert.h>
 #include <SDL2/SDL_keycode.h>
 
+#include "input_events.h"
 #include "util/log.h"
 
-enum sc_action {
-    SC_ACTION_DOWN,
-    SC_ACTION_UP,
-};
-
 #define SC_SDL_SHORTCUT_MODS_MASK (KMOD_CTRL | KMOD_ALT | KMOD_GUI)
 
 static inline uint16_t