CloudWatch: Made region visible for AWS Cloudwatch Expressions (#17243)

Fixes #14933

public/app/plugins/datasource/cloudwatch/partials/query.parameter.html

@@ -1,8 +1,18 @@
+<div class="gf-form-inline">
+        <div class="gf-form">
+                <label class="gf-form-label query-keyword width-8">Region</label>
+                <metric-segment segment="regionSegment" get-options="getRegions()" on-change="regionChanged()"></metric-segment>
+        </div>
+
+        <div class="gf-form gf-form--grow">
+                <div class="gf-form-label gf-form-label--grow"></div>
+        </div>
+</div>
+
 <div class="gf-form-inline" ng-if="target.expression.length === 0">
 	<div class="gf-form">
 		<label class="gf-form-label query-keyword width-8">Metric</label>
 
-		<metric-segment segment="regionSegment" get-options="getRegions()" on-change="regionChanged()"></metric-segment>
 		<metric-segment segment="namespaceSegment" get-options="getNamespaces()" on-change="namespaceChanged()"></metric-segment>
 		<metric-segment segment="metricSegment" get-options="getMetrics()" on-change="metricChanged()"></metric-segment>
 	</div>