Theme: update icon (#15258)

packages/theme-chalk/src/icon.scss

@@ -641,10 +641,6 @@
   content: "\e741";
 }
 
-.el-icon-diamond:before {
-  content: "\e742";
-}
-
 .el-icon-medal:before {
   content: "\e743";
 }
@@ -657,10 +653,6 @@
   content: "\e745";
 }
 
-.el-icon-wallet-2:before {
-  content: "\e746";
-}
-
 .el-icon-wallet-1:before {
   content: "\e747";
 }