QColor: fix misleading code in op==

For HSL colors, the (heavily over-parenthesized) code compared hslHue
values mod 36000, _and also_ for equality. Of course, the second
comparison is dead code.

This was a cut'n'paste error from the non-HSL comparison.

So, remove it. And also some of the over-parenthesization.

There are no tests for operator==, and the HSL color comparison is
completely opaque for me, so I'm not going to write any for this
trivial change.

Change-Id: I74572273730cb5cc9f427c524c268ba3f90304c1
Reviewed-by: Olivier Goffart (Woboq GmbH) <ogoffart@woboq.com>

src/gui/painting/qcolor.cpp

@@ -2415,8 +2415,7 @@ bool QColor::operator==(const QColor &color) const
 {
     if (cspec == Hsl && cspec == color.cspec) {
         return (ct.argb.alpha == color.ct.argb.alpha
-                && ((((ct.ahsl.hue % 36000) == (color.ct.ahsl.hue % 36000)))
-                    || (ct.ahsl.hue == color.ct.ahsl.hue))
+                && ct.ahsl.hue % 36000 == color.ct.ahsl.hue % 36000
                 && (qAbs(ct.ahsl.saturation - color.ct.ahsl.saturation) < 50
                     || ct.ahsl.lightness == 0
                     || color.ct.ahsl.lightness == 0