PB-818: Ensuring scales are respected on print - #minor

[ltkum]

Issue : When we were sending print requests, the scales of the symbols and texts in kmls were off. For icons, they were too small, and the texts were too big.

Fix : We corrected the scales for icons and labels. Icons used a DPI adaptation of 90 / 254 which was inherited from the old mapviewer. After some empirical testing, it looks like on the new mapviewer needs a 150 / 254 DPI adaptation Labels were not using the 'scale' parameter for the fonts at all, and they now also use a 150 / 254 DPI adaptation.

It is important to note that the '254' given here is a computed value, as some layers will have smaller resolutions and their DPI will be used in those situations

While testing, try to test with different screens, to ensure the result is consistent at all times.

Test link

[cypress[bot]]

web-mapviewer    Run #3283

Run Properties:   Passed #3283  •  f4e125cf46: PB-818: adapt unit tests

Project	web-mapviewer
Branch Review	bugfix-PB-818-font-and-image-size-dont-match-in-print
Run status	Passed #3283
Run duration	04m 52s
Commit	f4e125cf46: PB-818: adapt unit tests
Committer	Martin Künzi
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Test results
Failures	0
Flaky	0
Pending	21
Skipped	0
Passing	210
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