Fix bash completion with single arg.
Fix bash completion with single arg.

Previously the script was assuming that a single arg meant that a mux
command must be next.  However, mux now supports calling just
'mux projet-name', meaning the bash completion script should do the
same.

danimad/tmuxinator,sideci-sample/sideci-sample-tmuxinator,andyw8/tmuxinator,azat/tmuxinator,aMoniker/tmuxinator,cinaeco/tmuxinator,jasonchaffee/tmuxinator,jasonchaffee/tmuxinator,ethagnawl/tmuxinator,aMoniker/tmuxinator,magicalbanana/tmuxinator,klaxalk/tmux,J3RN/tmuxinator,danimad/tmuxinator,podung/tmuxinator,tmuxinator/tmuxinator,marcinmagier/tmuxinator,cinaeco/tmuxinator,jlipps/tmuxinator,aMoniker/tmuxinator,magicalbanana/tmuxinator,jasonchaffee/tmuxinator,sjfloat/tmuxinator,klaxalk/tmux,marwensaid/tmuxinator,pczarn/tmuxinator,guyhughes/tmuxinator,guyhughes/tmuxinator,ethagnawl/tmuxinator,marcinmagier/tmuxinator,benizi/tmuxinator,azat/tmuxinator,J3RN/tmuxinator,sachin21/tmuxinator,sachin21/tmuxinator,marwensaid/tmuxinator,adamstrickland/tmuxinator,jlipps/tmuxinator,azat/tmuxinator,pczarn/tmuxinator,tmuxinator/tmuxinator,klaxalk/tmux,benizi/tmuxinator,danimad/tmuxinator,jlipps/tmuxinator,J3RN/tmuxinator,podung/tmuxinator,sideci-sample/sideci-sample-tmuxinator,cinaeco/tmuxinator,sjfloat/tmuxinator,guyhughes/tmuxinator,sachin21/tmuxinator,klaxalk/tmux,adamstrickland/tmuxinator,podung/tmuxinator,marcinmagier/tmuxinator,pczarn/tmuxinator,benizi/tmuxinator,andyw8/tmuxinator,sjfloat/tmuxinator,marwensaid/tmuxinator,magicalbanana/tmuxinator,tmuxinator/tmuxinator,klaxalk/tmux,adamstrickland/tmuxinator,ethagnawl/tmuxinator