Remove unneeded 'battery voltage' legend that is breifly displayed and

causes temporary formatting issues.

main.html

@@ -189,7 +189,7 @@
                             <div class="battery-status"></div>
                         </div>
                     </div>
-                    <div class="battery-legend">Battery voltage</div>
+                    <div class="battery-legend"></div>
                     <div class="bottomStatusIcons">
                         <div class="armedicon cf_tip" i18n_title="mainHelpArmed"></div>
                         <div class="failsafeicon cf_tip" i18n_title="mainHelpFailsafe"></div>