Network: Fix mingw-gcc warning

Fix warning: missing braces around initializer for 'BYTE [6] {aka unsigned char [6]}'

Change-Id: Ic247ff0721955c4562ed027fad7cb3786809a840
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>
Reviewed-by: Shane Kearns <shane.kearns@accenture.com>

src/network/socket/qlocalserver_win.cpp

@@ -126,7 +126,7 @@ bool QLocalServerPrivate::addListener()
         }
 #endif
 
-        SID_IDENTIFIER_AUTHORITY WorldAuth = SECURITY_WORLD_SID_AUTHORITY;
+        SID_IDENTIFIER_AUTHORITY WorldAuth = { SECURITY_WORLD_SID_AUTHORITY };
         if (!AllocateAndInitializeSid(&WorldAuth, 1, SECURITY_WORLD_RID,
             0, 0, 0, 0, 0, 0, 0,
             &worldSID)) {