Bug #21496: Unable to install windows packages using the EXE provider

When called without a title parameter, the windows 'start' function collects any additional command line switches to itself rather than passing them along to the command to be started.

exe_package.rb correctly added the title parameter for uninstalls but did not have the same call signature for the install_command.

This patch should resolve the issue by titling install created windows as 'puppet-install'.