[flutter_tools]fix typo in printHowToConsumeAar,which case sync fail

[vimerzhao]

Description

according to: Groovy Language Documentation:

Any Groovy expression can be interpolated in all string literals, apart from single and triple-single-quoted strings.

I change typo ' to ", and modify related tests.

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[blasten]

This is fine. Did you intend to fix a typo or change " for '?

[vimerzhao]

This is fine. Did you intend to fix a typo or change " for '?

yes! ' will not work actually.

[zanderso]

[PR Triage] I suspect Linux customer_testing is failing because the PR needs to be rebased. @vimerzhao could you please try rebasing this PR on to of master to retrigger the presubmit checks? Thanks!

[jonahwilliams]

LGTM