[Improvement] When the occupied storage is > 1 GB, it shouldn't be rounded

[tprudentova]

Current behaviour: the occupied storage is 1.73 GB but next to the progress bar it's rounded to 1 GB

Expected behaviour: it's also displayed as 1.73 GB

[tprudentova]

@MontaGhanmy

[ericlinagora]

Could be worth combining work with issue #478