clock displays midnight as 12AM instead of 00AM

https://github.com/DarkFlippers/unleashed-firmware/pull/288

thanks Smileycathy1128

applications/plugins/clock_app/clock_app.c

@@ -39,11 +39,12 @@ static void clock_render_callback(Canvas* const canvas, void* ctx) {
     } else {
         bool pm = curr_dt.hour > 12;
         bool pm12 = curr_dt.hour >= 12;
+        bool am12 = curr_dt.hour == 0;
         snprintf(
             time_string,
             TIME_LEN,
             CLOCK_TIME_FORMAT,
-            pm ? curr_dt.hour - 12 : curr_dt.hour,
+            pm ? curr_dt.hour - 12 : (am12 ? 12 : curr_dt.hour),
             curr_dt.minute,
             curr_dt.second);
 
@@ -237,4 +238,4 @@ int32_t clock_app(void* p) {
     free(plugin_state);
 
     return 0;
-}
+}