修复多表头列宽存在偏差的问题

Author: huangshuwei

packages/ve-table/src/body/index.jsx

@@ -548,8 +548,7 @@ export default {
          */
         tdSizeChange({ key, width }) {
             const { colsWidths } = this;
-            // math floor
-            colsWidths.set(key, Math.floor(width));
+            colsWidths.set(key, width);
             this.$emit(EMIT_EVENTS.BODY_CELL_WIDTH_CHANGE, colsWidths);
         },