#872 Use Player#hasPermission instead of custom PermissionHandler method

- Use Player#hasPermission to check if a player has a permission
- Remove hasPermission method from PermissionHandler implementations

src/main/java/fr/xephi/authme/permission/handlers/VaultHandler.java

@@ -44,11 +44,6 @@ public class VaultHandler implements PermissionHandler {
         return vaultProvider.hasGroupSupport();
     }
 
-    @Override
-    public boolean hasPermission(Player player, PermissionNode node) {
-        return vaultProvider.has(player, node.getNode());
-    }
-
     @Override
     public boolean hasPermissionOffline(String name, PermissionNode node) {
         return vaultProvider.has("", name, node.getNode());