Gives more room for project column

The text in the project column of the change list was being truncated on
wide displays, even when extra horizontal space was available but used
up by the change subject column. With this change, the project column
doubles its width when the browser viewport is large.

Change-Id: I83f7fbc1dec5aa19e9b3d8f5c17d136b9a62fb38

polygerrit-ui/app/styles/gr-change-list-styles.html

@@ -135,6 +135,9 @@ limitations under the License.
         :host {
           font-size: 14px;
         }
+        .project {
+          width: 20em;
+        }
       }
     </style>
   </template>