win: Use full console width for status messages.

The original overprinting code, added in 7b3d8c8e, used printf for printing
the status.  printf needs one column for the cursor, so the status message
could only take up `width - 1` columns.  fc554c22 changed Windows from printf
to WriteConsoleOutput which doesn't move the cursor, so keeping one column
empty is no longer needed. So stop doing that.

Also remove a duplicate call to GetConsoleScreenBufferInfo.
Merge pull request #873 from nico/full

win: Use full console width for status messages.