Fix #1008: Use capitalized variant name when registering badging tasks

[lihenggui]

What I have done and why
Use capitalized variant names when registering badging tasks.

Before:

After

Fixes #1008

Do tests pass?

• [✓] Run local tests on DemoDebug variant: ./gradlew testDemoDebug
• [✓] Check formatting: ./gradlew --init-script gradle/init.gradle.kts spotlessApply

Is this your first pull request?

• [ ✓] Sign the CLA
• [✓ ] Run ./tools/setup.sh
• [✓ ] Import the code formatting style as explained in the setup script.

[dturner]

Thanks for doing this, and for fixing the trailing commas.

Usually I'd request that the formatting changes be done in a separate PR but in this case it's still fairly obvious what is being changed.