remove not used property

public/app/plugins/datasource/stackdriver/partials/query.aggregation.html

@@ -8,7 +8,6 @@
       placeholder="'Select Aggregation'"
       className="'width-15'"
       variables="ctrl.templateSrv.variables"
-      group-name="'Aggregations'"
     ></metric-select>
   </div>
   <div class="gf-form gf-form--grow">
@@ -30,7 +29,6 @@
       placeholder="'Select Alignment'"
       className="'width-15'"
       variables="ctrl.templateSrv.variables"
-      group-name="'Alignment Options'"
     ></metric-select>
 
     <div class="gf-form gf-form--grow"><div class="gf-form-label gf-form-label--grow"></div></div>
@@ -46,7 +44,6 @@
       placeholder="'Select Alignment'"
       className="'width-15'"
       variables="ctrl.templateSrv.variables"
-      group-name="'Alignment Periods'"
     ></metric-select>
   </div>
 

public/app/plugins/datasource/stackdriver/partials/query.filter.html

@@ -20,7 +20,6 @@
       value="ctrl.target.metricType"
       options="ctrl.getMetricsList()"
       variables="ctrl.templateSrv.variables"
-      group-name="'Metric Types'"
       placeholder="'Select Metric'"
       className="'width-15'"
     ></metric-select>