fix(graph): add missing ctrl in variable

public/app/plugins/panel/graph/axisEditor.html

@@ -184,7 +184,7 @@
 				<li ng-if="panel.legend.rightSide" class="tight-form-item">
 					Side width
 				</li>
-				<li ng-if="panel.legend.rightSide" style="width: 105px">
+				<li ng-if="ctrl.panel.legend.rightSide" style="width: 105px">
 					<input type="number" class="input-small tight-form-input" placeholder="250" bs-tooltip="'Set a min-width for the legend side table/block'" data-placement="right"
 					ng-model="ctrl.panel.legend.sideWidth" ng-change="ctrl.render()" ng-model-onblur>
 				</li>