Make scale of workspace on secondary monitor 'var' instead of 'const'.

This makes it consitent with 'MAX_THUMBNAIL_SCALE' from workspaceThumbnail.js which is also 'var'.
11 jobs for !1772 with master in 5 minutes and 1 second (queued for 1 second)
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Status Job ID Name Coverage
  Pre Review
passed #1212237
check_commit_log

00:01:44

passed #1212238
check-merge-request

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  Prep
passed #1212239
build-fedora-container

00:00:57

 
  Review
passed #1212241
eslint

00:00:57

passed #1212242
eslint_mr

00:00:57

passed #1212240
js_check

00:00:29

passed #1212244
no_template_check

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passed #1212243
potfile_check

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  Build
passed #1212245
build

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passed #1212246
flatpak
flatpak

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  Test
passed #1212247
test

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