Updated the default class name

• Updated:
- the default class name

app/javascript/gabsocial/components/block.js

@@ -10,7 +10,7 @@ class Block extends React.PureComponent {
     const { children } = this.props
 
     return (
-      <div className={[_s._, _s.boxShadowBlock, _s.bgPrimary, _s.overflowHidden, _s.radiusSmall].join(' ')}>
+      <div className={[_s.d, _s.boxShadowBlock, _s.bgPrimary, _s.overflowHidden, _s.radiusSmall].join(' ')}>
         {children}
       </div>
     )