fix: add Palestine to supported countries

Emby.Server.Implementations/Localization/countries.json

@@ -557,6 +557,12 @@
         "ThreeLetterISORegionName": "OMN",
         "TwoLetterISORegionName": "OM"
     },
+    {
+        "DisplayName": "Palestine",
+        "Name": "PS",
+        "ThreeLetterISORegionName": "PSE",
+        "TwoLetterISORegionName": "PS"
+    },
     {
         "DisplayName": "Panama",
         "Name": "PA",