Move Sketchbook preparation before Theme.init()
Move Sketchbook preparation before Theme.init()

Fixes NPE when searching for themes in portable installation

me-no-dev/Arduino-1,me-no-dev/Arduino-1,me-no-dev/Arduino-1,me-no-dev/Arduino-1,me-no-dev/Arduino-1,me-no-dev/Arduino-1,me-no-dev/Arduino-1,me-no-dev/Arduino-1