Diff UI applies colour inconsistently

[mamachanko]

What steps did you take:

The Diff UI applies colour inconsistently when toggling groups.

What happened:

📺 screen recording

Environment:

• kapp version (use kapp --version): 0.52.0
• OS (e.g. from /etc/os-release): macOS
• Kubernetes version (use kubectl version):

Client Version: version.Info{Major:"1", Minor:"23", GitVersion:"v1.23.1", GitCommit:"86ec240af8cbd1b60bcc4c03c20da9b98005b92e", GitTreeState:"clean", BuildDate:"2021-12-16T11:33:37Z", GoVersion:"go1.17.5", Compiler:"gc", Platform:"darwin/amd64"}
Server Version: version.Info{Major:"1", Minor:"23", GitVersion:"v1.23.5", GitCommit:"c285e781331a3785a7f436042c65c5641ce8a9e9", GitTreeState:"clean", BuildDate:"2022-03-24T22:06:50Z", GoVersion:"go1.17.8", Compiler:"gc", Platform:"linux/amd64"}

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[100mik]

--diff-ui-alpha is generally used by us for debugging with sticky edge cases, it's not something users generally end up using.

Will take a look at it tho!