Make action names to block and hide more clear

The `hide` action was calling the `block` method while the `soft_block`
action was calling the `hide` method.

Combined with the fact that we also have a `block` permission which is
used in `ModerateActions` the logic was hard to follow.

app/assets/stylesheets/moderation/users/index.scss

@@ -8,11 +8,11 @@
     justify-content: flex-end;
   }
 
-  .soft-block-link {
+  .hide-link {
     @include hollow-button($color-warning);
   }
 
-  .hide-link {
+  .block-link {
     @include hollow-button($alert-color);
   }
 }