thrift: fix copy-pasta: findName -> findValue
thrift: fix copy-pasta: findName -> findValue

Summary: The name is not used with `{{name}}` so doesn't have any impact, but still...

Reviewed By: yfeldblum

Differential Revision: D5500661

fbshipit-source-id: 9240e78b02ef52a3e3a82dd12a56eec5cf82c6d9

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