Adjust checkbox padding.

services/web/public/stylesheets/app/login-register.less

@@ -112,7 +112,7 @@
 
 		.login-register-newsletter {
 			font-size: 90%;
-			margin: @line-height-computed -(@line-height-computed) 0;
+			margin-top: @line-height-computed;
 			text-align: left;
 
 			& > .checkbox {