Made ToStringVisitor backwards compatible with older behavior.
Made ToStringVisitor backwards compatible with older behavior.

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

evolutional/flatbuffers,google/flatbuffers,google/flatbuffers,google/flatbuffers,evolutional/flatbuffers,alexames/flatbuffers,stewartmiles/flatbuffers,evolutional/flatbuffers,evolutional/flatbuffers,stewartmiles/flatbuffers,google/flatbuffers,alexames/flatbuffers,alexames/flatbuffers,google/flatbuffers,pjulien/flatbuffers,stewartmiles/flatbuffers,google/flatbuffers,pjulien/flatbuffers,pjulien/flatbuffers,royalharsh/flatbuffers,royalharsh/flatbuffers,google/flatbuffers,pjulien/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,alexames/flatbuffers,stewartmiles/flatbuffers,google/flatbuffers,pjulien/flatbuffers,google/flatbuffers,google/flatbuffers,royalharsh/flatbuffers,evolutional/flatbuffers,DavadDi/flatbuffers,evolutional/flatbuffers,stewartmiles/flatbuffers,alexames/flatbuffers,royalharsh/flatbuffers,alexames/flatbuffers,pjulien/flatbuffers,DavadDi/flatbuffers,DavadDi/flatbuffers,alexames/flatbuffers,stewartmiles/flatbuffers,alexames/flatbuffers,alexames/flatbuffers,pjulien/flatbuffers,google/flatbuffers,stewartmiles/flatbuffers,alexames/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,alexames/flatbuffers,evolutional/flatbuffers,pjulien/flatbuffers,alexames/flatbuffers,royalharsh/flatbuffers,evolutional/flatbuffers,stewartmiles/flatbuffers,royalharsh/flatbuffers,evolutional/flatbuffers,DavadDi/flatbuffers,pjulien/flatbuffers,stewartmiles/flatbuffers,pjulien/flatbuffers,stewartmiles/flatbuffers,pjulien/flatbuffers,google/flatbuffers,stewartmiles/flatbuffers,evolutional/flatbuffers,google/flatbuffers,royalharsh/flatbuffers,royalharsh/flatbuffers,stewartmiles/flatbuffers,DavadDi/flatbuffers,google/flatbuffers,DavadDi/flatbuffers,evolutional/flatbuffers,alexames/flatbuffers,pjulien/flatbuffers,stewartmiles/flatbuffers,royalharsh/flatbuffers,google/flatbuffers,royalharsh/flatbuffers