lock-dialog: add style_provider to current screen globally

  gtk_style_context_add_provider_for_screen (gdk_screen_get_default(),
                                           GTK_STYLE_PROVIDER (style_provider),
                                           GTK_STYLE_PROVIDER_PRIORITY_USER);

  https://developer.gnome.org/gtk3/stable/GtkStyleContext.html#gtk-style-context-add-provider-for-screen

css data is located at /usr/share/mate-screensaver/lock-dialog-THEME.css,
XDG_CONFIG_HOME/gtk-3.0/gtk.css, /usr/share/themes/...

/usr/share/mate-screensaver/lock-dialog-THEME.css file has highest priority, if exists:

  $ gsettings get org.mate.screensaver lock-dialog-theme
  'test'
  $ grep lock-dialog /usr/share/mate-screensaver/lock-dialog-test.css
  .lock-dialog.background {
  .lock-dialog frame {
  .lock-dialog notebook {
  .lock-dialog entry,
  .lock-dialog entry:focus {
  .lock-dialog button,
  .lock-dialog button:focus {
  .lock-dialog button:hover,
  .lock-dialog button:hover:active {
  ...

Otherwise:

  /usr/share/themes folder if lock-dialog-theme is set to 'debault'
  $ gsettings get org.mate.screensaver lock-dialog-theme
  'default'
  $ gsettings get org.mate.interface gtk-theme
  'TraditionalOk'
  $ grep lock-dialog /usr/share/themes/TraditionalOk/gtk-3.0/*.css
  /usr/share/themes/TraditionalOk/gtk-3.0/mate-applications.css:.lock-dialog {
  /usr/share/themes/TraditionalOk/gtk-3.0/mate-applications.css:.lock-dialog notebook {

Priority order: https://developer.gnome.org/gtk3/stable/GtkStyleProvider.html

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