Fixed show-account --filter-branch capability

Somehow the filter-branch capability got removed in an early revision
of the initial project check-in.  Re-enabled that functionality for now,
will be working on making it regex-capable shortly.

Change-Id: I86fc5ef91eb5d88e250e3564c49217a5964ab1b6

src/main/java/com/google/gerrit/plugins/ShowAccountCommand.java

diff --git a/src/main/java/com/google/gerrit/plugins/ShowAccountCommand.java b/src/main/java/com/google/gerrit/plugins/ShowAccountCommand.java
index 2c80d51..bc6981e 100644
--- a/src/main/java/com/google/gerrit/plugins/ShowAccountCommand.java
+++ b/src/main/java/com/google/gerrit/plugins/ShowAccountCommand.java
@@ -151,7 +151,8 @@
 
         Collections.sort(groupInfos, new CustomComparator());
         for (GroupInfo groupInfo : groupInfos) {
-          if (null == filterGroups) {
+          if (null == filterGroups || groupInfo.name.toLowerCase().contains(filterGroups.toLowerCase
+              ())) {
             stdout.println(groupInfo.name);
           }
         }