spec: make libnotify available on build time again

this fails the import check otherwise

Author: deltragon

rpm/python-safeeyes.spec

@@ -16,11 +16,13 @@ BuildRequires:  python3-devel
 BuildRequires:  desktop-file-utils
 BuildRequires:  gettext
 
-# for audiblealert plugin
-Requires: (ffmpeg-free or pipewire-utils)
 # for notification plugin
+BuildRequires: libnotify
 Requires: libnotify
 
+# for audiblealert plugin
+Requires: (ffmpeg-free or pipewire-utils)
+
 # for smartpause plugin (optional in pyproject.toml)
 BuildRequires: python3-pywayland
 Requires: python3-pywayland