Debugger[CDB]: Use file normalization function from utils.

Remove complicated/expensive function in dbgwinutils
in favour of the utils one (improved to upper case
the drive letter) as it is sufficient now with
the improved checking in editor manager/location mark.

src/plugins/debugger/cdb/cdbengine.cpp

@@ -2477,7 +2477,7 @@ CdbEngine::NormalizedSourceFileName CdbEngine::sourceMapNormalizeFileNameFromDeb
                                                   DebuggerToSource);
     // Up/lower case normalization according to Windows.
 #ifdef Q_OS_WIN
-    QString normalized = winNormalizeFileName(fileName);
+    QString normalized = Utils::normalizePathName(fileName);
 #else
     QString normalized = fileName;
 #endif