Fix missing break when parsing allow-package-shareduid

Not using a flag because the fix can't be more straightforward, trivial
and safe.

Bug: 348301951
Flag: EXEMPT bugfix
Test: presubmit
Change-Id: I7903d300c70514027df783b614fbe816df989654
diff --git a/services/core/java/com/android/server/SystemConfig.java b/services/core/java/com/android/server/SystemConfig.java
index 44aea15..e2ab0d9 100644
--- a/services/core/java/com/android/server/SystemConfig.java
+++ b/services/core/java/com/android/server/SystemConfig.java
@@ -1603,7 +1603,7 @@
                         } else {
                             mPackageToSharedUidAllowList.put(pkgName, sharedUid);
                         }
-                    }
+                    } break;
                     case "asl-file": {
                         String packageName = parser.getAttributeValue(null, "package");
                         String path = parser.getAttributeValue(null, "path");