[gnome-panel] themes: don't use GtkButton

[Alberts Muktupāvels <muktupavels src gnome org>]

commit dd96b0f1b6a18e3cce7b54cfe8f9e52f7f87ab23
Author: Alberts Muktupāvels <alberts muktupavels gmail com>
Date:   Fri Oct 30 21:49:15 2015 +0200

    themes: don't use GtkButton
    
    It is not needed and it will not work in GTK+ 3.20+.

 gnome-panel/Adwaita.css      |    6 +++---
 gnome-panel/HighContrast.css |   12 ++++++------
 2 files changed, 9 insertions(+), 9 deletions(-)
---
diff --git a/gnome-panel/Adwaita.css b/gnome-panel/Adwaita.css
index 609ce3b..cc9c57e 100644
--- a/gnome-panel/Adwaita.css
+++ b/gnome-panel/Adwaita.css
@@ -26,9 +26,9 @@ PanelApplet > GtkMenuBar.menubar .menuitem:hover {
        color: @theme_selected_fg_color;
 }
 
-PanelApplet GtkButton#tasklist-button,
-PanelApplet GtkButton#clock-applet-button,
-PanelApplet GtkButton#showdesktop-button {
+PanelApplet #tasklist-button,
+PanelApplet #clock-applet-button,
+PanelApplet #showdesktop-button {
        padding: 0px 4px;
        color: @theme_unfocused_text_color;
        border: 0;
diff --git a/gnome-panel/HighContrast.css b/gnome-panel/HighContrast.css
index 01c2e41..bd7d02f 100644
--- a/gnome-panel/HighContrast.css
+++ b/gnome-panel/HighContrast.css
@@ -25,18 +25,18 @@ PanelApplet > GtkMenuBar.menubar .menuitem:hover {
        color: @theme_selected_fg_color;
 }
 
-PanelApplet GtkButton#tasklist-button,
-PanelApplet GtkButton#clock-applet-button,
-PanelApplet GtkButton#showdesktop-button {
+PanelApplet #tasklist-button,
+PanelApplet #clock-applet-button,
+PanelApplet #showdesktop-button {
        padding: 0px 4px;
        color: @theme_unfocused_fg_color;
        border: 0;
        border-radius: 0;
 }
 
-PanelApplet GtkButton#tasklist-button:checked,
-PanelApplet GtkButton#clock-applet-button:checked,
-PanelApplet GtkButton#showdesktop-button:checked {
+PanelApplet #tasklist-button:checked,
+PanelApplet #clock-applet-button:checked,
+PanelApplet #showdesktop-button:checked {
        background-color: @theme_selected_bg_color;
        color: @theme_selected_fg_color;
 }