More typos

Author: nygrenh

app/models/remote_sandbox.rb

@@ -15,8 +15,9 @@ def initialize(baseurl)
   end
 
   def self.try_to_send_submission_to_free_server(submission, notify_url)
-    servers = if submission.exercise && ExerciseDir.get(submission.exercise.clone_path).safe_for_experimental_sandbox
-      if ExerciseDir.exercise_type == "java_maven"
+    dir = ExerciseDir.get(submission.exercise.clone_path)
+    servers = if submission.exercise && dir.safe_for_experimental_sandbox
+      if dir.type == "java_maven"
         all_experimental.shuffle
       else
         all_experimental.shuffle + all.shuffle