Fix incorrect callback arguments

* src/gpa-marshal.list: Add two entries.
* src/gpacontext.c (gpa_context_class_init): Fix "progress" signal.
* src/gpakeyexpireop.c (gpa_key_expire_operation_class_init):
Use gpa_marshal_VOID__POINTER_POINTER.

Some users reported a crash downstream in Gentoo with
g_type_check_is_value_type getting a garbage type. This turns out to
be because 95e07080a2a08196cafb05b69345ea1d629424b1 replaced the
types (and argument counts) incorrectly.

Fix that by adding to gpa_marshal.list to create custom marshal types
and use those instead, and fix the argument count.

Bug: https://bugs.gentoo.org/957196
Fixes: 95e07080a2a08196cafb05b69345ea1d629424b1

ChangeLog entries added by wk.

• Signed-off-by: Sam James <sam@gentoo.org>