tests: remove a"| head -n 2" that just hides an error code
The output from core used to be longer and it made sense, but no
longer does.
CORE-TEST-OUTPUT-UPDATE: 5199c5b6fd29
all: tutorials/tutorial.rst tutorials/topic-tutorial.rst static/logo-evolve.ico
sphinx-build . ../html/
tutorials/tutorial.rst: tutorials/tutorial.t test2rst.py
python test2rst.py tutorials/
tutorials/topic-tutorial.rst: tutorials/topic-tutorial.t test2rst.py
python test2rst.py tutorials/
static/logo-evolve.ico: static/logo-evolve.svg
convert -resize 36x36 static/logo-evolve.svg static/logo-evolve.ico