fix broken TiddlySpaceTiddlerIcon tests
fix broken TiddlySpaceTiddlerIcon tests

for some reason the tests are failing
I couldn't trace the cause but it's due to incorrectly set fixtures
which this solves

FND/tiddlyspace,TiddlySpace/tiddlyspace,FND/tiddlyspace,TiddlySpace/tiddlyspace,TiddlySpace/tiddlyspace,FND/tiddlyspace