GroupConfig: Remove unnecessary semicolon

This caused a warning in Eclipse.

Change-Id: I36f730affc35c65b9cb8aec1ff5a1b03ad0d754b
Signed-off-by: Edwin Kempin <ekempin@google.com>
diff --git a/java/com/google/gerrit/server/group/db/GroupConfig.java b/java/com/google/gerrit/server/group/db/GroupConfig.java
index 9756c88..dec4850 100644
--- a/java/com/google/gerrit/server/group/db/GroupConfig.java
+++ b/java/com/google/gerrit/server/group/db/GroupConfig.java
@@ -297,7 +297,6 @@
             .map(subgroupModification -> subgroupModification.apply(originalSubgroups))
             .map(ImmutableSet::copyOf)
             .filter(subgroups -> !originalSubgroups.equals(subgroups));
-    ;
     if (updatedSubgroups.isPresent()) {
       saveSubgroups(updatedSubgroups.get());
     }