Move to using upstream glfw fix for mojave initial render issue

glfw/cocoa_window.m

@@ -568,16 +568,6 @@ static GLFWapplicationshouldhandlereopenfun handle_reopen_callback = NULL;
     [super dealloc];
 }
 
--(void)setLayer:(CALayer*)layer
-{
-    [super setLayer:layer];
-    if (window->context.client != GLFW_NO_API) {
-        // this is needed for initial rendering on mojave, see
-        // https://github.com/kovidgoyal/kitty/issues/887
-        [window->context.nsgl.object update];
-    }
-}
-
 - (_GLFWwindow*)glfwWindow {
     return window;
 }
@@ -602,6 +592,14 @@ static GLFWapplicationshouldhandlereopenfun handle_reopen_callback = NULL;
     return YES;
 }
 
+- (void)updateLayer
+{
+    if (window->context.client != GLFW_NO_API)
+        [window->context.nsgl.object update];
+
+    _glfwInputWindowDamage(window);
+}
+
 - (id)makeBackingLayer
 {
     if (window->ns.layer)