Fix resolution of bar charts

[Flix6x]

Merging PR #310 seems to have failed, in the end leaving only its changelog entry on main.

[nhoening]

Weird. The merge commit still looks okay, but the PR reports only the changelog entry.

Btw, adding ".diff" to a URL can give you a diff file which you can apply locally: https://github.com/FlexMeasures/flexmeasures/commit/fd848f09565566b568e85588cf0e2b8dcd86c8a8.diff

[nhoening]

The Unix patch command should help applying such a diff file.

[Flix6x]

Huh, upon further inspection it looks like the changes are actually already incorporated on main. It seems as if my pre-merge (from project-9 into the dev branch for PR #310) ended up moving the meat of that PR into PR #313.