[gnome-control-center] (16 commits) ...sound: Remove unused variable

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

Summary of changes:

  9b41718... power: Capitalize and improve labels (*)
  be5d6bf... power: Scale row subtitles to 0.9 (*)
  f833bb1... power: Tweak margins and spacing (*)
  b46aef0... display: Make night light dialog a GtkBin (*)
  50be7b1... display: Make night light a panel page (*)
  28b0acb... display: Rework Night Light page (*)
  70b6688... network: Equal spacing between list sections (*)
  ed8561c... wifi: Reorder icons displayed for wifi access points (*)
  e08bc03... network: Add NetDeviceWifi::scanning property (*)
  0d9aa40... wifi: Add device widgets after caching in the array (*)
  c4e8464... wifi: Show a spinner when scanning for new access points (*)
  e8bd7c2... sound: Remove icon from sound theme buttons (*)
  a9f0248... sound: Use fallback icon when stream's icon doesn't exist (*)
  0412844... project: Update subprojects (*)
  b542e98... sounds: Use correct mute icon in the input section (*)
  05b531e... sound: Remove unused variable (*)

(*) This commit already existed in another branch; no separate mail sent