tweak button font color #6611

Job	Run time
build-and-check	2m 48s
test-integration-packages/internal	1m 5s
test-integration-packages/billing	1m 13s
test-integration-cli	44s
test-integration-packages/agent-runtime	39s
test-integration-web	43s
test-integration-common	43s
test-packages/agent-runtime	42s
test-.agents	45s
test-cli	54s
test-packages/internal	52s
test-packages/billing	45s
test-common	42s
test-integration-sdk	1m 14s
test-sdk	48s
test-web	1m 2s
	15m 39s

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