Remove ability to specify expire_time

LfsToken#token does not need the ability to specify expire_time

lib/gitlab/lfs_token.rb

@@ -30,8 +30,8 @@ module Gitlab
         end
     end
 
-    def token(expire_time: DEFAULT_EXPIRE_TIME)
-      HMACToken.new(actor).token(expire_time)
+    def token
+      HMACToken.new(actor).token(DEFAULT_EXPIRE_TIME)
     end
 
     def token_valid?(token_to_check)