Minor GraphQL page improvements

[dihmeetree]

• Schema will show (waiting to receive schema) until the schema is actually requested. (There's no point to show the editor box if there's no schema)
  

• Added default values for the Query and Variables editors (Most people coming to this page might not even know what GraphQL is. So it's best to give them an example of a query and the correct variables to pass. They can go right to the GraphQL page and click the runQuery button)
  

• Response will show (waiting to receive response) (Similar to reasoning above)
  

• Decreased the minLines for variables to 10, minLines for variables to 5, and minLines for response to 10.

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