fix reversed hide/unhide basic icons

src/elements/basic.icon.less

@@ -144,8 +144,8 @@ i.basic.icon.paint:before { content: '\e7b5'; } /* '' */
 i.basic.icon.edit:before { content: '\270d'; } /* '✍' */
 i.basic.icon.eject:before { content: '\2ecf'; } /* '⻏' */
 i.basic.icon.export:before { content: '\e715'; } /* '' */
-i.basic.icon.hide:before { content: '\e80f'; } /* '' */
-i.basic.icon.unhide:before { content: '\e70b'; } /* '' */
+i.basic.icon.hide:before  { content: '\e70b'; } /* '' */
+i.basic.icon.unhide:before { content: '\e80f'; } /* '' */
 i.basic.icon.facebook:before { content: '\f301'; } /* '' */
 i.basic.icon.fast-forward:before { content: '\e804'; } /* '' */
 i.basic.icon.fire:before { content: '🔥'; } /* '\1f525' */