Align "Set Up Syncing" button in prefs

chrome/content/zotero/preferences/preferences_sync.xul

@@ -75,7 +75,8 @@
 											<textbox id="sync-password" type="password"
 												onkeypress="Zotero_Preferences.Sync.credentialsKeyPress(event);"/>
 										</row>
-										<vbox align="center">
+										<row>
+											<box/>
 											<hbox align="baseline">
 												<button id="sync-auth-button"
 													label="&zotero.preferences.sync.setUpSync;"
@@ -83,7 +84,7 @@
 													disabled="true"/>
 												<label id="sync-status-indicator"/>
 											</hbox>
-										</vbox>
+										</row>
 									</rows>
 								</grid>
 								<vbox style="width:2em"/>

chrome/skin/default/zotero/preferences.css

@@ -118,6 +118,10 @@ grid row hbox:first-child
 	margin-right: 10px;
 }
 
+#zotero-prefpane-sync #sync-auth-button {
+	margin-left: 0;
+}
+
 #zotero-prefpane-sync #sync-status-indicator
 {
 	width: 1.5em;