[Cleanup] Remove unnecessary switch on `BindingType` in `SourceFiles#generatedClassNameForBinding() #4682

Job	Run time
Validate Dagger version	15s
Bazel build	6m 7s
Bazel tests	19m 16s
Artifact Java local tests	5m 24s
Artifact verification tests	14m 45s
Artifact Android local tests (AGP 7.0.0)	8m 56s
Test Hilt Gradle plugin	10m 34s
Artifact Android local tests (AGP 7.1.2)	6m 42s
Artifact Android emulator tests (API ${{ matrix.api-level }})	0s
Artifact Android local tests (AGP 8.1.0)	59s
Build Hilt Gradle plugin against latest AGP version	0s
Clean up GitHub Action caches	7s
Publish snapshot	0s
	1h 13m 5s

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