Fix text color of progress/find status summary label

Using a themed text color instead of a hard-coded one and making sure
that ManhattanStyle does not tweak it.

Task-number: QTCREATORBUG-16643
Change-Id: I4bac9b29ee3c293270f39438664d617ac7591c8e
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/texteditor/basefilefind.cpp

@@ -471,6 +471,7 @@ CountingLabel::CountingLabel()
     f.setPointSizeF(StyleHelper::sidebarFontSize());
     setFont(f);
     setPalette(StyleHelper::sidebarFontPalette(palette()));
+    setProperty("_q_custom_style_disabled", QVariant(true));
     updateCount(0);
 }