Fix PackageInstaller displays with multi-user

With this fix, when all users cancel installing an app they were warned about,
then the "Installing..." screen disappears, as desired.

Bug: 7255231
Change-Id: I2475fa790a5d09abbf94411c696682502fb1e8df

Author: rich cannings

services/java/com/android/server/pm/PackageManagerService.java

@@ -6401,7 +6401,7 @@ public void handleStartCopy() throws RemoteException {
                  * do, then we'll defer to them to verify the packages.
                  */
                 final int requiredUid = mRequiredVerifierPackage == null ? -1
-                        : getPackageUid(mRequiredVerifierPackage, 0);
+                        : getPackageUid(mRequiredVerifierPackage, getUser().getIdentifier());
                 if (requiredUid != -1 && isVerificationEnabled(flags)) {
                     final Intent verification = new Intent(
                             Intent.ACTION_PACKAGE_NEEDS_VERIFICATION);