stormlib: remove an assert causing troubles
Apparently many maps have invalid attributes (probably from protection) and this assert would crash aura when loading some maps:

'''
aura++: /home/josko/projects/aura-bot/StormLib/src/SFileAttributes.cpp:129: DWORD CheckSizeOfAttributesFile(DWORD, DWORD, DWORD): Assertion `false' failed.
Aborted (core dumped)
'''

For now the easiest way is to remove the assert which solves the problem.