dev_scripts: Alter the shadow-utils fix

Instead of reinstalling shadow-utils, use the actual fix that the Fedora
devs have suggested (rpm --restore shadow-utils). The previous method
does not seem to work on Fedora 37, and it threw the following error
when building the development environment:

    Installed package shadow-utils-2:4.12.3-3.fc37.x86_64 (from koji-override-0) not available.
    Error: No packages marked for reinstall.
    Error: building at STEP "RUN dnf reinstall -y shadow-utils && dnf clean all": while running runtime: exit status 1

dev_scripts/env.py

@@ -74,7 +74,7 @@
 
 # FIXME: Drop this fix after it's resolved upstream.
 # See https://github.com/freedomofpress/dangerzone/issues/286#issuecomment-1347149783
-RUN dnf reinstall -y shadow-utils && dnf clean all
+RUN rpm restore -y shadow-utils
 
 RUN dnf install -y mupdf && dnf clean all
 """
@@ -120,7 +120,7 @@
 
 # FIXME: Drop this fix after it's resolved upstream.
 # See https://github.com/freedomofpress/dangerzone/issues/286#issuecomment-1347149783
-RUN dnf reinstall -y shadow-utils && dnf clean all
+RUN rpm restore -y shadow-utils
 """
 
 # The Dockerfile for building an environment with Dangerzone installed in it. Parts of