Fix MSVC errors in tbprobe.cpp

Fix MSVC errors in tbprobe.cpp

Default template parameters values and recursive functions do not play well
together. Fix for below errors that showed up after updating to latest MSVC.

````
tbprobe.cpp(1156): error C2672:
    'search': no matching overloaded function found

tbprobe.cpp(1198): error C2783:
  'Tablebases::WDLScore `anonymous-namespace'::search(Position &,Tablebases::ProbeState *)':
could not deduce template argument for 'CheckZeroingMoves'

````

Closes https://github.com/official-stockfish/Stockfish/pull/1594

No functional change.