Update emformer tests to avoid 0/1 specialization issue

[GregoryComer]

Summary: The tests break in some dynamo configurations. Set min batch to 2 to be exportable in all.

Reviewed By: abhinaykukkadapu

Differential Revision: D100391669

[pytorch-bot]

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❌ 1 New Failure, 28 Pending

As of commit 7ba99a6 with merge base 3a72c4f ():

NEW FAILURE - The following job has failed:

• pull / android / run-emulator (gh)
  The process '/usr/bin/sh' failed with exit code 1

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[meta-codesync]

@GregoryComer has exported this pull request. If you are a Meta employee, you can view the originating Diff in D100391669.

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