This to support code that relied on tables being multiline,
but not vectors.

This behavior was changed in:
https://github.com/google/flatbuffers/commit/b1a925dfc2ac78508aee89029e950057405f0a0a#diff-c45c8fbffbc64f7ff4aa2978612b10d8

Change-Id: I4c95471b643b2b3fab95e06b1294e19d686b492c