aptpkg: Fix call to get_selections()
aptpkg: Fix call to get_selections()

This was passing "hold" as a name, not a quoted string (which succeeded
since there is a function named "hold" in the module), causing the
retrieved selections to be empty, leading to a traceback when the
function later tries to run set_selections().

saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt,saltstack/salt