Change the background color of the selected text in a text box. (#5628)

* Change the background color of the selected text in a text box.
The new background color matches the green background of selected items in a tree view.

* Add selection-background-color for QLineEdit widgets in the classic theme, but keep the color as it was.

data/themes/classic/style.css

@@ -35,6 +35,7 @@ QLineEdit {
 	border: 2px inset rgba(91,101,113,128);
 	background: #49515b;
 	color: #e0e0e0;
+	selection-background-color: #202020;
 }
 
 

data/themes/default/style.css

@@ -62,6 +62,7 @@ QLineEdit {
 	border: 1px;
 	background: #101213;
 	color: #d1d8e4;
+	selection-background-color: #17793b;
 }
 
 QLineEdit:read-only {