core: respect install_sysconfdir_samples in meson file

The refactoring done in e11a25cadb caused the configuration files to be
installed into the pkgsysconfdir regardless of the state of the
install_sysconfdir_samples boolean that indicates whether or not the
sample files should be installed.

src/core/meson.build

@@ -195,7 +195,7 @@ foreach item : in_files
                 output: file,
                 command : [meson_render_jinja2, config_h, '@INPUT@'],
                 capture : true,
-                install : dir != 'no',
+                install : (dir == pkgsysconfdir and install_sysconfdir_samples) or (dir != pkgsysconfdir and dir != 'no'),
                 install_dir : dir)
 endforeach