Fixes <https://bugs.gnu.org/34995>.
This is a followup to abd4d6b33d.
* guix/packages.scm (package->bag): Adjust calls to INPUTS,
PROPAGATED-INPUTS, NATIVE-INPUTS, and ARGS, passing them SELF as an
argument.
* gnu/packages/gnucash.scm (gnucash)[arguments]: Use (package-inputs
this-record) intead of (inputs).
* gnu/packages/version-control.scm (git)[arguments]: Likewise.