Remove duplicated fixtures
This MR removes fixtures which are already used by flint_norpc
. It was noticed by @matias.guijarro in #1150 (closed).
It could reduce segfault when testing GUI without RPC. But i spent a lot of time in the BCU-CI computer, trying to reproduce any segfault without both this patch, or any success.
That's anyway better to clean up the code this way.