Fix .menu-item-active::after style

* See: https://github.com/next-theme/hexo-theme-next/issues/850

source/css/_schemes/Pisces/_menu.styl

@@ -10,12 +10,23 @@
 
   a {
     padding: 5px 20px;
+    // For .menu-item-active::after
     position: relative;
     transition-property: background-color;
     menu-item-row();
+  }
 
-    if (not hexo-config('menu_settings.badges')) {
-      &.menu-item-active::after {
+  +tablet-mobile() {
+    &.menu-item-search {
+      display: none;
+    }
+  }
+}
+
+if (not hexo-config('menu_settings.badges')) {
+  // Only apply to the main menu
+  // Fix issue #850
+  .main-menu .menu-item-active::after {
     background: $grey;
     border-radius: 50%;
     content: ' ';
@@ -26,12 +37,4 @@
     top: 50%;
     width: 6px;
   }
-    }
-  }
-
-  +tablet-mobile() {
-    &.menu-item-search {
-      display: none;
-    }
-  }
 }