More changes for Shlwapi registry functions

[Guy L. Albertelli]

Changelog:
Guy Albertelli  <<galberte at neo.lrun.com>>

  dlls/shlwapi/reg.c
   - Correct implementation of HUSKEY internals, including functions:
      SHRegOpenUSKey{A|W}, SHRegCloseUSKey, SHRegGetUSValue{A|W},
      SHRegQueryInfoUSKey{A|W}
   - Implement SHRegQueryUSValue{A|W}
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