fix Event structure alignment between C and D

src/jtk/event.d

@@ -8,7 +8,7 @@ import jtk.timer;
 
 struct Event
 {
-    enum Type : ubyte
+    enum : uint
     {
         WINDOW_CLOSE,
         WINDOW_EXPOSE,
@@ -41,7 +41,8 @@ struct Event
         uint height;
     };
 
-    Type type;
+    uint type;
+    uint _pad;
     union
     {
         KeyEvent key_event;

src/jtk/jtk.c

@@ -339,7 +339,8 @@ typedef struct {
 } jtk_window_resize_event_t;
 
 typedef struct {
-    uint8_t type;
+    uint32_t type;
+    uint32_t _pad;
     union {
         jtk_key_event_t key_event;
         jtk_button_event_t button_event;