misc/ios: fix teamID and appID use in entitlements

This is a follow-up to CL 8910.
This is the version that I have tested and which works
when appID and teamID are not the same (which they appear
to be for the builder).

I am unsure how I submitted it with the wrong code.

Change-Id: I186e34e91953d082b507390c1cd2042e5419c4c9
Reviewed-on: https://go-review.googlesource.com/8943Reviewed-by: David Crawshaw <crawshaw@golang.org>

misc/ios/go_darwin_arm_exec.go

@@ -618,11 +618,11 @@ func entitlementsPlist() string {
 <plist version="1.0">
 <dict>
 	<key>keychain-access-groups</key>
-	<array><string>` + teamID + `.golang.gotest</string></array>
+	<array><string>` + appID + `.golang.gotest</string></array>
 	<key>get-task-allow</key>
 	<true/>
 	<key>application-identifier</key>
-	<string>` + teamID + `.golang.gotest</string>
+	<string>` + appID + `.golang.gotest</string>
 	<key>com.apple.developer.team-identifier</key>
 	<string>` + teamID + `</string>
 </dict>