Theme: update icons (#15272)

packages/theme-chalk/src/icon.scss

@@ -489,7 +489,7 @@
   content: "\e71f";
 }
 
-.el-icon-circle-check-outline:before {
+.el-icon-circle-check:before {
   content: "\e720";
 }
 
@@ -601,7 +601,7 @@
   content: "\e73d";
 }
 
-.el-icon-notification:before {
+.el-icon-news:before {
   content: "\e73e";
 }
 
@@ -901,7 +901,7 @@
   content: "\e78c";
 }
 
-.el-icon-circle-close-outline:before {
+.el-icon-circle-close:before {
   content: "\e78d";
 }
 
@@ -1041,7 +1041,7 @@
   content: "\e7af";
 }
 
-.el-icon-s-kpi:before {
+.el-icon-s-flag:before {
   content: "\e7b0";
 }