general: UI: change QSplitter style

Signed-off-by: Andrei Popa <andrei.popa@analog.com>

Author: andrei47w

gui/style/qss/generic/global.qss

@@ -10,8 +10,8 @@ QWidget {
 QSplitter { color: &content_default& }
 QSplitter::handle:horizontal { width: 6px; }
 QSplitter::handle:vertical { height: 6px; }
-QSplitter::handle:hover { background-color: rgba(0, 0, 0, 40); }
-QSplitter::handle:pressed { background-color: rgba(0, 0, 0, 70); }
+QSplitter::handle:hover { background-color: &background_secondary&; }
+QSplitter::handle:pressed { background-color: &background_secondary&; }
 QSplitter::handle:disabled { background-color: transparent; }
 
 QTextBrowser {