Fix rename variable bug by always passing additionalVars to the scratch-blocks prompt callback. Let scratch-blocks decide whether or not to use the additional vars based on whether the variable is local or global.
Fix rename variable bug by always passing additionalVars to the scratch-blocks prompt callback. Let scratch-blocks decide whether or not to use the additional vars based on whether the variable is local or global.

cwillisf/scratch-gui,cwillisf/scratch-gui,LLK/scratch-gui,LLK/scratch-gui,cwillisf/scratch-gui