Utils: Drop unused headers [A-H]

Round 2 - focus on sources.
For classes with initial in range [A-H].
Try to keep the same separators between different kind of headers.

Change-Id: I838a8324ddd5b4d8d5a51b8f30605f783c663813
Reviewed-by: hjk <hjk@qt.io>

src/libs/utils/detailswidget.cpp

@@ -24,6 +24,7 @@
 ****************************************************************************/
 
 #include "detailswidget.h"
+
 #include "detailsbutton.h"
 #include "hostosinfo.h"
 #include "theme/theme.h"