Ref confirm. Removes unused code. Fix noLowFee directive

www/views/topup.html

@@ -19,7 +19,7 @@
         <div class="amount-label">
           <div class="amount-final">{{amountUnitStr}}</div>
           <div class="alternative">
-            <span ng-if="rate">@ 
+            <span ng-if="rate">@
               {{rate | currency:cardInfo.currencySymbol:2}} per BTC</span>
             <span ng-if="!rate">...</span>
           </div>
@@ -60,23 +60,17 @@
   </ion-content>
 
   <click-to-accept
-    ng-disabled="!cardInfo || !wallet"
     ng-click="topUpConfirm()"
     ng-if="!isCordova && cardInfo"
     click-send-status="sendStatus"
-    has-wallet-chosen="wallet"
-    insufficient-funds="insufficientFunds"
-    no-matching-wallet="!cardInfo">
+    is-disabled="!cardInfo || !wallet">
     Add funds
   </click-to-accept>
   <slide-to-accept
-    ng-disabled="!cardInfo || !wallet"
     ng-if="isCordova && cardInfo"
     slide-on-confirm="topUpConfirm()"
     slide-send-status="sendStatus"
-    has-wallet-chosen="wallet"
-    insufficient-funds="insufficientFunds"
-    no-matching-wallet="!cardInfo">
+    is-disabled="!cardInfo || !wallet">
     Slide to confirm
   </slide-to-accept>
   <slide-to-accept-success