fix(module:date-picker): fix z-index to auto in inline mode (#7172)

Author: cipchk

components/date-picker/style/patch.less

@@ -6,5 +6,8 @@
     &-range-arrow {
       display: none !important;
     }
+    &-dropdown {
+      z-index: auto;
+    }
   }
 }