[pgAdmin4][Patch]: RM_ 2658 - Improve help message for "binary paths" entered in Preferences

[Surinder Kumar]

Hi

*Issue:*

The user seems to enter sometimes paths with quotes and sometimes add
spaces which lead to failure of Backup, Restore or Maintenance utility.

*Changes:*

 - Added a note in help string `Note: Don't add quote(s) or space(s) before
or after the path.`

 - Remove whitespace before/after the value before it gets saved.

Please find attached patch and review.

Thanks,
Surinder

RM_2658.patch
Description: Binary data