[gtk/wip/matthiasc/center-layout] Sync the switch-off icon from 3.x

[Matthias Clasen <matthiasc src gnome org>]

commit fde02b8dc12bfd028b93a13cd2c49dee2c73c7e8
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri Jan 25 15:31:23 2019 -0500

    Sync the switch-off icon from 3.x

 .../16x16/status/switch-off-symbolic.symbolic.png  | Bin 201 -> 250 bytes
 gtk/icons/scalable/status/switch-off-symbolic.svg  |  62 +++++++++++++++++++++
 2 files changed, 62 insertions(+)
---
diff --git a/gtk/icons/16x16/status/switch-off-symbolic.symbolic.png 
b/gtk/icons/16x16/status/switch-off-symbolic.symbolic.png
index 2c23b35f82..ac5df3fe2f 100644
Binary files a/gtk/icons/16x16/status/switch-off-symbolic.symbolic.png and 
b/gtk/icons/16x16/status/switch-off-symbolic.symbolic.png differ
diff --git a/gtk/icons/scalable/status/switch-off-symbolic.svg 
b/gtk/icons/scalable/status/switch-off-symbolic.svg
new file mode 100644
index 0000000000..10b40b5975
--- /dev/null
+++ b/gtk/icons/scalable/status/switch-off-symbolic.svg
@@ -0,0 +1,62 @@
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