collection-status only works with spaces in filepath.

Since revision 1171, collection-status only processes filenames with spaces, due to an error in the code added in revision 1171.

The error code is:
        # quick fix to spaces in filepath
        modified_filepath = ""

The code should be:
        # quick fix to spaces in filepath
        modified_filepath = filepath

This correction has been tested successfully on versions 0.7.06 and 0.7.13.1.

Duplicity version: 0.7.06 and 0.7.13.1
Python version: 2.7.12
OS Distro and version: Ubuntu 16.04
Type of target filesystem: Linux

Duplicity Command:
echo "=== Duplicity get dates ==="
PASSPHRASE='****' duplicity collection-status \
  --archive-dir="$ArchiveDir" --name="$ArchiveName" \
  --file-changed "$SearchName" \
  "file://$DestinationPath"

Before correction, collection-status output:
=== Duplicity get dates ===
Local and Remote metadata are synchronized, no sync needed.
Last full backup date: Sat Jul 29 15:00:46 2017
-------------------------
File: Misc/examples/yad_examples.sh
Total number of backup: 0
 Type of backup set: Time: Type of file change:
-------------------------

After correction, collection-status output:
=== Duplicity get dates ===
Local and Remote metadata are synchronized, no sync needed.
Last full backup date: Sat Jul 29 15:00:46 2017
-------------------------
File: Misc/examples/yad_examples.sh
Total number of backup: 15
 Type of backup set: Time: Type of file change:
                Full Sat Jul 29 15:00:46 2017 New
         Incremental Sun Jul 30 21:10:02 2017 Changed
         Incremental Mon Jul 31 16:30:02 2017 Changed
         Incremental Mon Jul 31 16:35:03 2017 Changed
         Incremental Thu Aug 3 22:55:03 2017 Changed
         Incremental Fri Aug 4 01:20:03 2017 Changed
         Incremental Fri Aug 4 09:20:02 2017 Changed
         Incremental Fri Aug 4 09:25:02 2017 Changed
         Incremental Fri Aug 4 09:35:11 2017 Changed
         Incremental Fri Aug 4 09:45:06 2017 Changed
         Incremental Fri Aug 4 09:55:05 2017 Changed
         Incremental Fri Aug 4 10:05:02 2017 Changed
         Incremental Fri Aug 4 14:45:02 2017 Changed
         Incremental Fri Aug 4 14:55:03 2017 Changed
         Incremental Fri Aug 4 19:30:03 2017 Changed
-------------------------