qt: Remove scrollbar.css and all its remaining mentions

Author: xdustinface

src/Makefile.qt.include

@@ -352,7 +352,6 @@ RES_CSS = \
   qt/res/css/dark.css \
   qt/res/css/general.css \
   qt/res/css/light.css \
-  qt/res/css/scrollbars.css \
   qt/res/css/traditional.css
 
 RES_FONTS = \

src/qt/dash.qrc

@@ -56,7 +56,6 @@
     </qresource>
     <qresource prefix="/css">
         <file alias="general">res/css/general.css</file>
-        <file alias="scrollbars">res/css/scrollbars.css</file>
         <file alias="Dark">res/css/dark.css</file>
         <file alias="Light">res/css/light.css</file>
         <file alias="Traditional">res/css/traditional.css</file>

src/qt/guiutil.cpp

@@ -98,8 +98,7 @@ static const std::map<QString, QString> mapStyleToTheme{
     {"general.css", ""},
     {"dark.css", "Dark"},
     {"light.css", "Light"},
-    {"traditional.css", "Traditional"},
-    {"scrollbars.css", ""}
+    {"traditional.css", "Traditional"}
 };
 
 /** Font related default values. */

src/qt/res/css/general.css

@@ -11,8 +11,7 @@ loaded and combined in `GUIUtil::loadStyleSheet()` in guitil.cpp.
 Hierarchy:
 
 *   general.css - base layout: Loaded first if selected theme is not "Traditional" (traditional.css)
-*   scrollbars.css - custom scrollbars: Loaded second only for windows/linux if general.css is loaded
-*   <theme.css> - theme css file:  Always loaded and loaded last.
+*   <theme.css> - theme css file: Always loaded last.
 
 To replace <theme.css> there are currently the following themes available: