[gnome-shell] volume: Fix overdrive in slider

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 79b54f65b45a58fe2b7937c4db85c0644b38c7d8
Author: Florian Müllner <fmuellner gnome org>
Date:   Wed Aug 7 14:55:49 2019 +0200

    volume: Fix overdrive in slider
    
    When setting a maximum value above 1, we currently set a non-existant
    maximum_level property instead of the actual 'maximum-value' one.
    
    https://gitlab.gnome.org/GNOME/gnome-shell/merge_requests/670

 js/ui/status/volume.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/js/ui/status/volume.js b/js/ui/status/volume.js
index 8ab001cd8..470e1f7b4 100644
--- a/js/ui/status/volume.js
+++ b/js/ui/status/volume.js
@@ -139,7 +139,7 @@ var StreamSlider = class {
     _amplifySettingsChanged() {
         this._allowAmplified = this._soundSettings.get_boolean(ALLOW_AMPLIFIED_VOLUME_KEY);
 
-        this._slider.maximum_level = this._allowAmplified
+        this._slider.maximum_value = this._allowAmplified
             ? this.getMaxLevel() : 1;
 
         if (this._stream)