Fixes a regression caused by my earlier checkin for bug 241854 (the Subscribe column wasn't centered anymore)

r=neil, sr=mscott

mailnews/base/resources/content/subscribe.xul

@@ -160,7 +160,7 @@
             <treecol id="nameColumn" persist="hidden" flex="1" primary="true" label="..."
                      sort="?LeafName"/>
             <splitter class="tree-splitter"/>
-            <treecol id="subscribedColumn" persist="hidden" label="&subscribedHeader.label;"
+            <treecol id="subscribedColumn" persist="hidden" cycler="true" label="&subscribedHeader.label;"
                      sort="?Subscribed"/>
             <!-- commenting out until bug 38906 is fixed 
             <splitter class="tree-splitter"/>
@@ -177,7 +177,7 @@
          <treecols>
            <treecol id="nameColumn2" persist="hidden" flex="1" primary="true" label="..." />
            <splitter class="tree-splitter"/>
-           <treecol id="subscribedColumn2" persist="hidden" label="&subscribedHeader.label;" />
+           <treecol id="subscribedColumn2" persist="hidden" cycler="true" label="&subscribedHeader.label;" />
            <!-- commenting out until bug 38906 is fixed 
            <splitter class="tree-splitter"/>
            <treecol id="messagesColumn2" persist="hidden" label="&messagesHeader.label;" /> -->

mailnews/news/src/nsNntpIncomingServer.cpp

@@ -1917,7 +1917,7 @@ nsNntpIncomingServer::SelectionChanged()
 NS_IMETHODIMP 
 nsNntpIncomingServer::CycleCell(PRInt32 row, nsITreeColumn* col)
 {
-    return NS_ERROR_NOT_IMPLEMENTED;
+    return NS_OK;
 }
 
 NS_IMETHODIMP