fix: the width prop of el-table-column is invalid when it is 0 (#8861)

* fix: the width prop of el-table-column is invalid when it is 0

* Update table-column.js

packages/table/src/table-column.js

@@ -99,7 +99,7 @@ const getDefaultColumn = function(type, options) {
     column.minWidth = 80;
   }
 
-  column.realWidth = column.width || column.minWidth;
+  column.realWidth = column.width === undefined ? column.minWidth : column.width;
 
   return column;
 };