update icon for flipping image

[koebel]

Description

In the scribbles for the dicom viewer app we had been using an icon for the flip image functionality that was not part of the remix icon set (the icon set didn't offer any icon for this purpose at that time). In the meanwhile the publishers of the remix icon set have added such an icon as suggested by us. In fact, they have even provided 2 variants (see Remix-Design/RemixIcon#650 (comment)). In this PR we have updated the icon to the one that was initially used in the scribbles.

Related Issue

• relates to icon and color definitions for dicom-viewer .dcm filetype web#10172 and Extension: DICOM Viewer #2

Motivation and Context

make UI more intuitive by using suitable, less ambiguous icons

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Tests only (no source changes)

Checklist:

• Code changes
• Unit tests added
• Acceptance tests added

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud