NSGL: Fix disabling of Retina resolution

It appears the default is now YES.

Fixes #1442.

README.md

@@ -147,6 +147,8 @@ information on what to include when reporting a bug.
  - [X11] Bugfix: Content scale fallback value could be inconsistent (#1578)
  - [Wayland] Bugfix: The `GLFW_HAND_CURSOR` shape used the wrong image (#1432)
  - [NSGL] Removed enforcement of forward-compatible flag for core contexts
+ - [NSGL] Bugfix: `GLFW_COCOA_RETINA_FRAMEBUFFER` had no effect on newer
+   macOS versions (#1442)
 
 
 ## Contact

src/nsgl_context.m

@@ -354,8 +354,7 @@ GLFWbool _glfwCreateContextNSGL(_GLFWwindow* window,
                                   forParameter:NSOpenGLContextParameterSurfaceOpacity];
     }
 
-    if (window->ns.retina)
-        [window->ns.view setWantsBestResolutionOpenGLSurface:YES];
+    [window->ns.view setWantsBestResolutionOpenGLSurface:window->ns.retina];
 
     GLint interval = 0;
     [window->context.nsgl.object setValues:&interval