Fix problem button used class action-primary changed color

Author: mrtuvn

app/design/frontend/Magento/blank/web/css/source/_buttons.less

@@ -25,7 +25,8 @@
         .lib-link-as-button();
     }
 
-    .action.primary {
+    .action.primary,
+    .action-primary {
         .lib-button-primary();
     }
 }

app/design/frontend/Magento/luma/web/css/source/_buttons.less

@@ -39,7 +39,8 @@
         .lib-link-as-button();
     }
 
-    .action.primary {
+    .action.primary,
+    .action-primary {
         .lib-button-primary();
     }
 }