Add missing include in ScreenCaptureKitCaptureSource.mm

https://bugs.webkit.org/show_bug.cgi?id=241479
<rdar://94747956>

Patch by Youssef Soliman <youssefdevelops@gmail.com> on 2022-06-09
Reviewed by Wenson Hsieh and Eric Carlson.

ScreenCaptureKitCaptureSource was missing the declaration for
CGDisplayModeGetPixelsWide and CGDisplayModeGetPixelsHigh which are
defined in <pal/spi/cg/CoreGraphicsSPI.h>, this was causing build failures
if the build order happened to change.

* Source/WebCore/platform/mediastream/mac/ScreenCaptureKitCaptureSource.mm:

Canonical link: https://commits.webkit.org/251440@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@295434 268f45cc-cd09-0410-ab3c-d52691b4dbfc

Source/WebCore/platform/mediastream/mac/ScreenCaptureKitCaptureSource.mm

@@ -36,6 +36,7 @@
 #import "RealtimeVideoUtilities.h"
 #import "ScreenCaptureKitSharingSessionManager.h"
 #import <ScreenCaptureKit/ScreenCaptureKit.h>
+#import <pal/spi/cg/CoreGraphicsSPI.h>
 #import <pal/spi/mac/ScreenCaptureKitSPI.h>
 #import <wtf/BlockObjCExceptions.h>
 #import <wtf/BlockPtr.h>