Don't manually copy completion files

pass 1.6.1 now does this for us when passing FORCE_ALL=1 to make

pass.spec

@@ -26,10 +26,6 @@ make DESTDIR=%{buildroot} PREFIX=%{_prefix} \
      BINDIR=%{_bindir} SYSCONFDIR=%{_sysconfdir} \
      MANDIR=%{_mandir} FORCE_ALL=1 \
      install
-install -d %{buildroot}%{_datadir}/zsh/site-functions/
-install -m 0644 src/completion/pass.zsh-completion %{buildroot}%{_datadir}/zsh/site-functions/_pass
-install -d %{buildroot}%{_datadir}/fish/completions/
-install -m 0644 src/completion/pass.fish-completion %{buildroot}%{_datadir}/fish/completions/pass.fish
 
 %files
 %doc README COPYING contrib