fix slider logic for touch device

to close #589

Author: Dave Conway-Jones

src/components/ui-component/templates/slider.html

@@ -41,7 +41,6 @@
         aria-label="{{me.item.label}}"
         ng-change="me.mchange()"
         ng-mouseup="me.mup()"
-        ng-mousedown="me.mdown()"
         ng-mouseleave="me.mleave()"
         ng-mouseenter="me.menter()"
         style="z-index:1; touch-action:none; min-width:32px;"

src/components/ui-component/ui-component-ctrl.js

@@ -349,8 +349,8 @@ angular.module('ui').controller('uiComponentController', ['$scope', 'UiEvents',
                         me.mdown = function() { me.active = true; };
                         me.menter = function() { me.active = true; };
                         me.mleave = function() { me.active = false; };
-                        me.mchange = function() { if (!me.active) { me.valueChanged(0); } }
-                        me.mup = function() { me.active = false; me.valueChanged(0); }
+                        me.mchange = function() { me.active = false; me.valueChanged(0); }
+                        me.mup = function() { if (me.active) { me.active = false; me.valueChanged(0); } }
                         break;
                     }
                 }