Adjust the pause instruction to correspond better to real TI-59.

I did some timing and a real TI-59 is counting up to 51 in 30 seconds
with the following simple program:

   + 1 = <pause> RST

The Android application was counting up to 127 in the same time. This
little delay adjustement will make the application closer to what a
real TI-59 is doing.