[SW-1465] Fix image stitching for greyscale images

[khughes-bdai]

Change Overview

Image stitcher currently crashes if run on a spot with greyscale cameras, this should resolve that error. See: https://github.com/bdaiinstitute/spot_ros2/issues/448

Testing Done

• [x] image stitcher on a spot with RGB cameras still works as expected
• [x] image stitcher on a spot with greyscale cameras doesn't crash and produces meaningful stitched images.

[khughes-bdai]

• #499 👈
• main

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[coveralls]

Pull Request Test Coverage Report for Build 11169291618

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 51.099%

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Totals
Change from base Build 11164121296:	0.0%
Covered Lines:	1929
Relevant Lines:	3775

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💛 - Coveralls

[khughes-bdai]

Testing succeeded on greyscale spot 🎉

[khughes-bdai]

Merge activity

• Oct 7, 3:28 PM EDT: @khughes-bdai started a stack merge that includes this pull request via Graphite.
• Oct 7, 3:29 PM EDT: @khughes-bdai merged this pull request with Graphite.