Debugger: Don't force dumper test to be build with forced debug

Does not seem to be needed and breaks builds on OS X 10.10 with
qmake CONFIG+=release CONFIG-=debug BUILD_TESTS=1:
"ld: library not found for -lUtils_debug"

Change-Id: I3c3e91d4045768f56ed6737410e09666e4e182ad
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

tests/auto/debugger/dumpers.pro

@@ -2,10 +2,6 @@ QT = core network
 
 QTC_LIB_DEPENDS += utils
 
-!win32 {
-CONFIG -= release
-CONFIG += debug
-}
 include(../qttest.pri)
 
 msvc {