fix 修复onMove返回值，无法阻止元素拖拽问题

[Guxingzhe]

Sortable onMove方法中，会根据返回值做判断拖拽过程，元素的插入情况

// Event when you move an item in the list or between lists
onMove: function (/*Event/evt, /*Event/originalEvent) {
// Example: https://jsbin.com/nawahef/edit?js,output
evt.dragged; // dragged HTMLElement
evt.draggedRect; // DOMRect {left, top, right, bottom}
evt.related; // HTMLElement on which have guided
evt.relatedRect; // DOMRect
evt.willInsertAfter; // Boolean that is true if Sortable will insert drag element after target by default
originalEvent.clientY; // mouse position
// return false; — for cancel
// return -1; — insert before target
// return 1; — insert after target
// return true; — keep default insertion point based on the direction
// return void; — keep default insertion point based on the direction
},

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[Alfred-Skyblue]

Thank you!