Revert "try to prevent safari from zooming in on double-tap"

Breaks drag and drop on android.

This reverts commit 3d010e47e1.

ui/chess/css/_control.scss

@@ -1,5 +1,4 @@
 .analyse-controls {
-  @extend %double-tap;
   display: flex;
   justify-content: space-between;
   align-items: stretch;

ui/common/css/abstract/_extends.scss

@@ -248,8 +248,3 @@
   width: 100%;
   height: 100%;
 }
-
-%double-tap {
-  // prevent iPad safari from zooming in on double tap
-  touch-action: manipulation;
-}

ui/common/css/component/_board.scss

@@ -1,5 +1,5 @@
 .main-board {
-  @extend %square, %double-tap;
+  @extend %square;
 
   &__preload {
     position: absolute;

ui/common/css/form/_cmn-toggle.scss

@@ -1,5 +1,4 @@
 .cmn-toggle {
-  @extend %double-tap;
   position: absolute;
   margin-left: -99999px;
 }

ui/round/css/_control.scss

@@ -1,5 +1,4 @@
 .rcontrols {
-  @extend %double-tap;
   text-align: center;
   width: 100%;
 

ui/round/css/_moves.scss

@@ -11,7 +11,7 @@
 }
 
 #{$rmoves-tag} {
-  @extend %flex-column, %double-tap;
+  @extend %flex-column;
 
   .buttons {
     @extend %box-shadow;