[U] Replace old theme with new official GUI

https://dortania.github.io/OpenCore-Post-Install/cosmetic/gui.html#setting-up-opencore-s-gui

EFI/OC/Config.plist

@@ -1502,7 +1502,7 @@
 			<key>PickerAudioAssist</key>
 			<false/>
 			<key>PickerMode</key>
-			<string>Builtin</string>
+			<string>External</string>
 			<key>PollAppleHotKeys</key>
 			<false/>
 			<key>ShowPicker</key>
@@ -1759,7 +1759,7 @@
 		<array>
 			<string>HfsPlus.efi</string>
 			<string>OpenRuntime.efi</string>
-			<string>#OpenCanopy.efi</string>
+			<string>OpenCanopy.efi</string>
 			<string>#AudioDxe.efi</string>
 			<string>#OpenUsbKbDxe.efi</string>
 			<string>#UsbMouseDxe.efi</string>