Description of problem:
timeshift operations using BTRFS fail with error:
E: ts: Failed to get partition list.

It behaves as it were starting in usb rescue mode only.

The error is due to a change in lsblk (util-linux). Versioning format changed colons to underscores (MAJ:MIN => MAJ_MIN)

Discussion about the error can be found in timeshift github:
https://github.com/teejee2008/timeshift/issues/425
https://github.com/teejee2008/timeshift/issues/753
https://github.com/teejee2008/timeshift/issues/755

A patch is already included in the source tree:
https://github.com/teejee2008/timeshift/commit/d437358ac3debf7625aefda4d0bd387a91b69df5#diff-5038e11d69860ae18e478e63e5f48c09b1ac2eb7a4c143f4b3e277523040712c

As patch:
https://github.com/teejee2008/timeshift/commit/d437358ac3debf7625aefda4d0bd387a91b69df5.patch


Version-Release number of selected component (if applicable):
timeshift-20.03-4
util-linux-2.37.2-1


How reproducible:
sudo timeshift --check
or
sudo timeshift --list
will trigger the error


Steps to Reproduce:
1. Install and setup timeshift using BTRFS
2. Run sudo timeshift --check

Actual results:
timeshift ends with an error:
E: ts: Failed to get partition list.


Expected results:
timeshift should not fail


Additional info:
A proposed patch is provided