Enable DuckPlayer on macOS (duckduckgo#2157)

Author: afterxleep

overrides/macos-override.json

@@ -85,7 +85,12 @@
             "exceptions": []
         },
         "duckPlayer": {
-            "state": "enabled"
+            "state": "enabled",
+            "features": {
+                "pip": {
+                    "state": "enabled"
+                }
+            }
         },
         "newTabContinueSetUp": {
             "state": "enabled",