Unit Tests - bug.628.t

- Quoting problem.  To prevent the shell from stripping quotes, the
  command line must include \" ... \", but in a Perl string, that
  needs to be \\" ... \\".  Silly mistake.

test/bug.628.t

@@ -43,7 +43,7 @@ if (open my $fh, '>', 'bug.rc')
 # Bug 628: task wait: with non-standard dateformat bug
 
 # Setup: Add a task
-qx{../src/task rc:bug.rc add wait:"Wed Jan 01 2020" A buggy task};
+qx{../src/task rc:bug.rc add wait:\\"Wed Jan 01 2020\\" A buggy task};
 
 # Result: Immediately delete the created task
 my $output = qx{../src/task rc:bug.rc waiting};