Fix another problem with clearing the last line of the display.
Fix another problem with clearing the last line of the
display.

Submitted by:	Kouichi Hirabayashi <kh@mogami-wire.co.jp>

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase