[dunecontrol] correct help screen for command 'all'

Previously, the command vcsetup, which is executed on command 'all',  was not
listed on the help screen.

bin/dunecontrol

@@ -332,7 +332,7 @@ update_HELP="updated all modules from the repository"
 autogen_HELP="run the autogen.sh script for each module. Does nothing, if CMake is activated"
 configure_HELP="run configure or cmake for each module"
 make_HELP="run make for each module"
-all_HELP="\trun 'autogen', 'configure' and 'make' command for each module"
+all_HELP="\trun 'vcsetup', 'autogen', 'configure' and 'make' command for each module"
 exec_HELP="execute an arbitrary command in each module source directory"
 bexec_HELP="execute an arbitrary command in each module build directory"
 status_HELP="show vc status for all modules"