wininet: Fix URLCache_LocalFileNameToPathA to return a full path, rather than just the container path.

[Robert Shearman]

This was caused by path_len including the nul-terminator and so the rest 
of the string was being added after the nul-terminator, which is 
incorrect. This is fixed by making path_len not include the nul-terminator.

Also fix a few other issues with the function, like not passing a 
correct length into the second call to WideCharToMultiByte, nRequired 
being calculated incorrectly and the string not always being nul-terminated.

Add a test for this function by testing the lpszLocalFileName field 
obtained from RetrieveUrlCacheEntryFileA.
---
  dlls/wininet/tests/urlcache.c |    1 +
  dlls/wininet/urlcache.c       |    8 ++++----
  2 files changed, 5 insertions(+), 4 deletions(-)
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