Add some confirm dialogs to scouting page to prevent dangerous actions.

Change-Id: I533bf92b8aedfd8d0029b98ebaf7ba12eecc1eae
Signed-off-by: Alex Perry <alex.perry96@gmail.com>
diff --git a/scouting/www/app.ts b/scouting/www/app.ts
index 285d306..e22fad0 100644
--- a/scouting/www/app.ts
+++ b/scouting/www/app.ts
@@ -15,6 +15,12 @@
   }
 
   switchTabTo(tab: Tab) {
-    this.tab = tab;
+    let shouldSwitch = true;
+    if (tab === 'ImportMatchList') {
+      shouldSwitch = window.confirm('Leave data scouting page?');
+    }
+    if (shouldSwitch) {
+      this.tab = tab;
+    }
   }
 }