snpeff: fix bug in wrapper script
snpeff: fix bug in wrapper script

Fixes issue with `-cancer` and `-canon` arguments passing through snpEff wrapper (chapmanb/bcbio-nextgen#441). Sent upstream so can remove on next release (pcingola/SnpEff#35).

Closes #1006.

DabeDotCom/homebrew-science,andrewjpage/homebrew-science,ahundt/homebrew-science,joshbode/homebrew-science,dpo/homebrew-science,parcollet/homebrew-science,ge11232002/homebrew-science,pmelsted/homebrew-science,philippbayer/homebrew-science,pditommaso/homebrew-science,kozo2/homebrew-science,aeantipov/homebrew-science,heuermh/homebrew-science,maplesond/homebrew-science,quantumsteve/homebrew-science,goxberry/homebrew-science