[Fixup] Fix my.cnf dependency

Fixup of commit:
  commit 45b40b2e9c515cfb04d6eaabc0c1b2e90eb1a535
  Author: Yaakov Selkowitz <yselkowi@redhat.com>
  Date:   Mon Apr 8 23:18:44 2024 -0400

Fixup contains:
 - use macro instead of '/etc/'
 - extend the condition to other occurences

mariadb10.11.spec

@@ -376,7 +376,7 @@ BuildArch:        noarch
 %if 0%{?flatpak}
 Requires:         mariadb-connector-c-config
 %else
-Requires:         /etc/my.cnf
+Requires:         %{_sysconfdir}/my.cnf
 %endif
 
 # Only conflicts, provides would add %%{_isa} provides for noarch,
@@ -455,8 +455,12 @@ Recommends:       %{pkgname}-backup%{?_isa} = %{sameevr}
 Suggests:         mytop
 Suggests:         logrotate
 
+%if 0%{?flatpak}
+Requires:         mariadb-connector-c-config
+%else
 Requires:         %{_sysconfdir}/my.cnf
 Requires:         %{_sysconfdir}/my.cnf.d
+%endif
 
 %virtual_conflicts_and_provides server