Remove the sidecond_first flag of apply-related tactics.
Remove the sidecond_first flag of apply-related tactics.

This was dead code.

ejgallego/coq,JasonGross/coq,JasonGross/coq,JasonGross/coq,Matafou/coq,ejgallego/coq,silene/coq,Zimmi48/coq,coq/coq,gares/coq,Zimmi48/coq,gares/coq,SkySkimmer/coq,coq/coq,ejgallego/coq,gares/coq,Matafou/coq,gares/coq,SkySkimmer/coq,gares/coq,SkySkimmer/coq,JasonGross/coq,Zimmi48/coq,SkySkimmer/coq,silene/coq,coq/coq,Matafou/coq,Zimmi48/coq,coq/coq,silene/coq,ejgallego/coq