fix: no space between title and history icon in tag-history view

The ' ' space that is in the h2 in the template is swallowed up by the material icon. By adding a manual margin of the width of a normal space (1/4th character width).

Another solution would be to replace the space with a ` `, but this adds the non-breaking space to the selection of text when highlighting words in the browser, which i did not prefer.

src/components/tag-history/tag-history.riot

@@ -287,5 +287,8 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
       flex-direction: row;
       align-items: center;
     }
+    h2 .material-icons {
+      margin-left: .25em;
+    }
   </style>
 </tag-history>