Remove screen static initializer

Most of the fields are initialized dynamically.

app/src/screen.c

@@ -194,9 +194,13 @@ screen_update_content_rect(struct screen *screen) {
 void
 screen_init(struct screen *screen, struct video_buffer *vb,
             struct fps_counter *fps_counter) {
-    *screen = (struct screen) SCREEN_INITIALIZER;
     screen->vb = vb;
     screen->fps_counter = fps_counter;
+
+    screen->resize_pending = false;
+    screen->has_frame = false;
+    screen->fullscreen = false;
+    screen->maximized = false;
 }
 
 static inline SDL_Texture *

app/src/screen.h

@@ -38,39 +38,6 @@ struct screen {
     bool mipmaps;
 };
 
-#define SCREEN_INITIALIZER { \
-    .vb = NULL, \
-    .fps_counter = NULL, \
-    .window = NULL, \
-    .renderer = NULL, \
-    .texture = NULL, \
-    .gl = {0}, \
-    .frame_size = { \
-        .width = 0, \
-        .height = 0, \
-    }, \
-    .content_size = { \
-        .width = 0, \
-        .height = 0, \
-    }, \
-    .resize_pending = false, \
-    .windowed_content_size = { \
-        .width = 0, \
-        .height = 0, \
-    }, \
-    .rotation = 0, \
-    .rect = { \
-        .x = 0, \
-        .y = 0, \
-        .w = 0, \
-        .h = 0, \
-    }, \
-    .has_frame = false, \
-    .fullscreen = false, \
-    .maximized = false, \
-    .mipmaps = false, \
-}
-
 // initialize default values
 void
 screen_init(struct screen *screen, struct video_buffer *vb,