BI-123725 fix: 使用统一的高亮cls

(cherry picked from commit cf5b898e36)

src/less/widget/multitree/check/multi.tree.check.pane.less

@@ -1,9 +0,0 @@
-@import "../../../index.less";
-
-.bi-multi-tree-check-pane {
-  & .multi-tree-continue-select {
-  }
-  & .multi-tree-check-selected {
-    color: @color-bi-text-multi-tree-check-pane-check-button;
-  }
-}

src/widget/multitree/check/multi.tree.check.pane.js

@@ -32,7 +32,7 @@ BI.MultiTreeCheckPane = BI.inherit(BI.Pane, {
             type: "bi.text_button",
             title: BI.i18nText("BI-Continue_Select"),
             text: BI.i18nText("BI-Continue_Select"),
-            cls: "multi-tree-check-selected"
+            cls: "bi-high-light",
         });
         continueSelect.on(BI.TextButton.EVENT_CHANGE, function () {
             opts.onClickContinueSelect();