fix alignment issue in chrome://settings

I missed this one when I was reformatting the controlled settings.

BUG=417624

Review URL: https://codereview.chromium.org/601283004

Cr-Commit-Position: refs/heads/master@{#296824}

chrome/browser/resources/options/content_settings.html

@@ -81,9 +81,11 @@
         <div class="radio controlled-setting-with-label">
           <label>
             <input type="radio" name="images" value="allow">
-            <span i18n-content="imagesAllow"></span>
-            <span class="controlled-setting-indicator"
-                content-setting="images" value="allow"></span>
+            <span>
+              <span i18n-content="imagesAllow"></span>
+              <span class="controlled-setting-indicator"
+                  content-setting="images" value="allow"></span>
+            </span>
           </label>
         </div>
         <div class="radio controlled-setting-with-label">