Drop the %_dbpath override from our test-container

This override exists to make system rpmdb accessible in eg "make shell"
but it causes complications wrt the prefix (see below + next commits) and
also masks test bugs (see previous commit).

We can resurrect this functionality later on if we find solutions that
avoid the issues.

This is the first step to fixing rpm-software-management#3521.

tests/Dockerfile.fedora

@@ -61,8 +61,6 @@ RUN rm -f /usr/lib/rpm/macros.d/macros.transaction_ima
 RUN dnf -y --enablerepo=updates install "sequoia-sq >= 1.0"
 RUN dnf clean all
 
-RUN echo "%_dbpath $(rpm --eval '%_dbpath')" > /root/.rpmmacros
-
 # Workaround for pkgconf(1)'s unlisted dependency on rpm.
 # This is needed for cmake to work without an rpm installation.
 RUN ln -sf $(rpm --eval '%{_target_platform}%{?_gnu}')-pkg-config \