Add missing semicolon

Arguably, the bug is in ImageJ 1.x' macro editor which tries to handle
assignments without trailing semicolon, but fails if the macro continues
with an 'e' after a number, even if there is a new line character between
them.

Noticed by Carl Philippe.

This fixes https://github.com/fiji/fiji/issues/104

Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>