Allow scouts to pre-scout matches using the app

Users can now select the new "pre-scouting" checkbox. That will bypass
the match list validation.

Signed-off-by: Philipp Schrader <philipp.schrader@gmail.com>
Change-Id: I35fed86b8107fc11a1335f73e679b1272d4da81b
diff --git a/scouting/www/entry/entry.ng.html b/scouting/www/entry/entry.ng.html
index 13cbe7f..e189ab0 100644
--- a/scouting/www/entry/entry.ng.html
+++ b/scouting/www/entry/entry.ng.html
@@ -56,6 +56,17 @@
         </option>
       </select>
     </div>
+    <div class="row">
+      <label>
+        <input
+          id="pre_scouting"
+          type="checkbox"
+          [(ngModel)]="preScouting"
+          (ngModelChange)="updateTeamSelectionValidity()"
+        />
+        Pre-scouting
+      </label>
+    </div>
     <div class="buttons">
       <!-- hack to right align the next button -->
       <div></div>