Remove redundant 'public' modifiers

CheckStyle reports 'public' being redundant on the constructor of
ApproveOption#Handler, but removing it causes test failures due to
org.kohsuke.args4j.Option requiring an explicitly public constructor.

Add a suppression for that one, and remove the 'public' in other
places where it's reported.

Change-Id: Ifbcf279ffa783d33b81efc1c675f468c3ea39135

gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/ProjectInfoScreen.java

@@ -727,7 +727,7 @@ public class ProjectInfoScreen extends ProjectScreen {
   private static class LabeledWidgetsGrid extends FlexTable {
     private String labelSuffix;
 
-    public LabeledWidgetsGrid() {
+    LabeledWidgetsGrid() {
       super();
       labelSuffix = ":";
     }