Fix build without BUILD_WITH_TFLITE_LIB

When compiling without BUILD_WITH_TFLITE_LIB, there's a trailing comma
in the constructor initialization list. Moving the comma into the
preprocessor block to fix compiling without BUILD_WITH_TFLITE_LIB.

Bug: None
Change-Id: I44ec474922f910254184aded8b347ace59459464
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6215653
Reviewed-by: Thomas Nguyen <tungnh@chromium.org>
Commit-Queue: Adam Ettenberger <Adam.Ettenberger@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#1413573}