wininet: Don't close the connection of the caller passes in zero for the number of bytes to be read.

[Robert Shearman]

Only close the connection when the bytes read equals the content length.

Fixup HTTP_DrainContent, which relied on the previous incorrect 
behaviour to instead close connections with no content length manually.
---
  dlls/wininet/http.c       |    6 ++++++
  dlls/wininet/internet.c   |    2 +-
  dlls/wininet/tests/http.c |    1 +
  3 files changed, 8 insertions(+), 1 deletions(-)
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