that -> this

[Originally there was a `var that = this` declaration](https://github.com/walterhiggins/ScriptCraft/commit/8056da0d3b8699dcad82c921dd26894ffc0d26a1#diff-620a3fa8f1a37223e9afbdfb5d2479a6R1227) that was taken out as part of the breakout of Drone pieces. This cleans up the final `that` which is currently present.