Remove the traceLog decorator from pretty_getcwd

`pretty_getcwd()` is called during module import (to set
`ORIGINAL_CWD`), and using a traced function creates unwanted
side effects.

Fixes: #1583

Author: ferdnyc

mock/py/mockbuild/util.py

@@ -884,7 +884,6 @@ def setup_host_resolv(config_opts):
     config_opts['nspawn_args'] += ['--bind={0}:/etc/resolv.conf'.format(resolv_path)]
 
 
-@traceLog()
 def pretty_getcwd():
     try:
         return os.getcwd()