Check MissingMethodFlags.COMMIT_CORRECTION at the right place

This is a follow up CL to my previous CL [1], which aimed to put an
early-exit check for

  InputConnection#commitCorrection(CorrectionInfo)

but mistakenly put it in

  InputConnection#commitCompletion(CompletionInfo).

With this CL the early-exit check will be placed at the right place.

 [1]: I3c58fadd924fad72cb984f0c23d3099fd0295c64
      19a80a1e

Fix: 193907158
Test: atest CtsInputMethodTestCases:InputConnectionEndToEndTest
Change-Id: I497628165072c73d0e279f89afe0d8730531ecfc