Fix ExtensionKit example

Need a valid `EXExtensionPointIdentifier` to install the app.

Signed-off-by: Brentley Jones <github@brentleyjones.com>

Author: brentleyjones

examples/integration/ExtensionKitExtension/Info.plist

@@ -15,7 +15,7 @@
 	<key>EXAppExtensionAttributes</key>
 	<dict>
         <key>EXExtensionPointIdentifier</key>
-        <string>com.apple.generic-extension</string>
+        <string>com.apple.services</string>
 	</dict>
 </dict>
 </plist>