Initialize the timer after the graphics device on desktop and web platforms. (#516)

This is already the order that is used for Android. It doesn't appear to
make a difference on desktop but on web using the timer before it's been
initialized (by glfwInit, inside InitGraphicsDevice) causes the a long
(and variable but often several seconds) sleep between the first and
second frame.

Fixes: 468309d ("Early-exit InitWindow if InitGraphicsDevice fails")

src/core.c

@@ -442,14 +442,14 @@ void InitWindow(int width, int height, void *data)
     uwpWindow = (EGLNativeWindowType)data;
 #endif
 
-    // Init hi-res timer
-    InitTimer();
-
     // Init graphics device (display device and OpenGL context)
     // NOTE: returns true if window and graphic device has been initialized successfully
     windowReady = InitGraphicsDevice(width, height);
     if (!windowReady) return;
 
+    // Init hi-res timer
+    InitTimer();
+
 #if defined(SUPPORT_DEFAULT_FONT)
     // Load default font
     // NOTE: External function (defined in module: text)