go through the visible data not through the whole data to prevent index (#4406)

issues

src/bootstrap-table.js

@@ -2448,7 +2448,7 @@ class BootstrapTable {
     }
 
     const rows = []
-    this.options.data.forEach((row, i) => {
+    this.data.forEach((row, i) => {
       if (!row.hasOwnProperty(obj.field)) {
         return false
       }