vmap-extractor doesn't extract unused maps

[pompolic-buh]

The vmap-extractor tool skips extraction of unused maps regardless of whether --skipJunkMaps is set to true or false. I believe the error is in this line, as it checks for the presence of the -s switch, which is used for a different option:

vmapexport.cpp:408

Steps to reproduce:

• Run vmap-extractor with the --skipJunkMaps false command line switch

• According to the output, map 13, map 25, map 29, map 35, map 37, map 42, map 44, map 169 and map 451 are skipped

I'll create a patch shortly.