cocoa-cb: don't set App icon when called from bundle

due to the bundle config the icon is set automatically via the bundle
system mechanisms. this also makes it possible to set the icon to a
custom one with the standard macOS copy paste method via the file info
dialogue.

Fixes #6874

video/out/cocoa_cb_common.swift

@@ -166,7 +166,9 @@ class CocoaCB: NSObject {
     }
 
     func setAppIcon() {
-        if let app = NSApp as? Application {
+        if let app = NSApp as? Application,
+            ProcessInfo.processInfo.environment["MPVBUNDLE"] != "true"
+        {
             NSApp.applicationIconImage = app.getMPVIcon()
         }
     }