FIX Quicktests

Vectorisation test case was always set to avx which is problematic on machines not having avx.

pystencils_tests/test_vectorization.py

@@ -7,7 +7,7 @@ from pystencils.cpu.vectorization import vectorize
 from pystencils.fast_approximation import insert_fast_sqrts, insert_fast_divisions
 from pystencils.transformations import replace_inner_stride_with_one
 
-supported_instruction_sets = get_supported_instruction_sets() if get_supported_instruction_sets() else []
+supported_instruction_sets = get_supported_instruction_sets()
 if supported_instruction_sets:
     instruction_set = "avx" if "avx" in supported_instruction_sets else "sse"
 else: