[0.4.8][NETREG] Fix 1 MSVC2010SP1 x86 dbg warning C4065 CORE-18104

[0.4.8][NETREG] Fix 1 MSVC2010SP1 x86 dbg warning C4065 CORE-18104

the warning can be observed with MSVC 2010SP1 (16.0.40219.1) x86 target in dbg configuation:
[11432/11751] Building CXX object modules\rosapps\applications\net\netreg\CMakeFiles\netreg.dir\netreg.cpp.obj
C:\047rls\reactos\modules\rosapps\applications\net\netreg\netreg.cpp(188) : warning C4065: switch statement contains 'default' but no 'case' labels

partial pick of 0.4.15-dev-2951-g 5d8e834897781944dcaf80de6c3df9c2c51212c7