[adwaita-icon-theme] preferences: use gear for all of them

[Tobias Bernard <tbernard src gnome org>]

commit e8d3b840b043cfc52098c2c8a6a200fcac42be93
Author: Tobias Bernard <tbernard gnome org>
Date:   Wed Jun 30 12:09:29 2021 +0200

    preferences: use gear for all of them

 Adwaita/scalable/actions/sidebar-hide-symbolic.svg          | 1 -
 Adwaita/scalable/categories/preferences-other-symbolic.svg  | 2 +-
 Adwaita/scalable/categories/preferences-system-symbolic.svg | 2 +-
 3 files changed, 2 insertions(+), 3 deletions(-)
---
diff --git a/Adwaita/scalable/categories/preferences-other-symbolic.svg 
b/Adwaita/scalable/categories/preferences-other-symbolic.svg
index f344c64d..0a8de2d9 100644
--- a/Adwaita/scalable/categories/preferences-other-symbolic.svg
+++ b/Adwaita/scalable/categories/preferences-other-symbolic.svg
@@ -1 +1 @@
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\ No newline at end of file
+<svg xmlns="http://www.w3.org/2000/svg"; width="16" height="16"><path d="M8 1c-.22 0-.44.011-.656.031l-.406 
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style="marker:none" color="#000" overflow="visible" fill="#474747"/></svg>
\ No newline at end of file
diff --git a/Adwaita/scalable/categories/preferences-system-symbolic.svg 
b/Adwaita/scalable/categories/preferences-system-symbolic.svg
index 98bd81bc..0a8de2d9 100644
--- a/Adwaita/scalable/categories/preferences-system-symbolic.svg
+++ b/Adwaita/scalable/categories/preferences-system-symbolic.svg
@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg"; width="16" height="16"><g color="#000" font-weight="400" 
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\ No newline at end of file
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\ No newline at end of file