Fix passing -submodules flag to git-init

[silverlyra]

Changes

In #1729, GitResource.GetInputTaskModifier was fixed to pass the -submodules flag to git-init when the submodules resource param is false. But I didn’t do it in a way that’s compatible with go’s flag.Bool, where you have to use the -flag=false syntax to set a default-true flag to false. 😑

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[tekton-robot]

Hi @silverlyra. Thanks for your PR.

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[ghost]

/ok-to-test

[silverlyra]

/retest

[vdemeester]

/lgtm

[tekton-robot]

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