[balooctl] Fix "index" command with already indexed, but moved file

Summary:
If I move a file (while baloo was not running) and perform `balooctl index` on new file
(so that document Id is not changed), it won't update the path of the file, keeping the
invalid entry in index.
Explicitly tell Baloo that we want to update everything concerning this file.

BUG: 397242
FIXED-IN: 5.52

Test Plan:
1) `echo "hello world" >~/file1`
2) `balooctl stop`
3) `mv ~/file1 ~/file2`
4) `balooctl start && balooctl index ~/file2`
5) `balooshow file2` and `balooshow -x <DOCUMENT_ID_OF_FILE>`
The first command should show the right path, and the second command shouldn't complain about bug in Baloo (invalid index entry)

Reviewers: #baloo, #frameworks, ngraham

Reviewed By: #baloo, ngraham

Subscribers: ngraham, kde-frameworks-devel

Tags: #frameworks, #baloo

Differential Revision: https://phabricator.kde.org/D15944