Fix pytest2 executable

Back in the days, they called it `py.test`. That was cool but now it's
annoying to me.

tox.ini

@@ -24,11 +24,9 @@ commands =
     coverage report --fail-under 100 --include 'tests/*' --omit 'tests/main_py38_test.py'
 
     # Run in reverse order, just in case
-    pytest tests/main_test.py::test_b_run_second tests/main_test.py::test_a_run_first
+    coverage run -m pytest tests/main_test.py::test_b_run_second tests/main_test.py::test_a_run_first
 
 [testenv:py{38,39}-pytest{3,4,5,6,7}]
-deps =
-    {[testenv]deps}
 commands =
     coverage run -m pytest tests/main_test.py::test_a_run_first tests/main_test.py::test_b_run_second
     coverage run -m pytest tests/main_py38_test.py::test_a_run_first tests/main_py38_test.py::test_b_run_second
@@ -41,17 +39,11 @@ commands =
 
 
 [testenv:py{36,37}-pytest7]
-deps=
-    {[testenv]deps}
 setenv =
     PRAGMA_VERSION = lt_py38
 
 [testenv:py{35,36,37}-pytest{2,3,4,5,6}]
-deps=
-    {[testenv]deps}
 setenv =
-    pytest2: PYTEST_CMD = py.test
-    !pytest2: PYTEST_CMD = pytest
     PRAGMA_VERSION = lt_py38
 
 [testenv:py{27}-{backports,functools32}-pytest{2,3,4}]
@@ -61,8 +53,6 @@ deps =
     backports: backports.functools_lru_cache
     functools32: functools32
 setenv =
-    pytest2: PYTEST_CMD = py.test
-    !pytest2: PYTEST_CMD = pytest
     PRAGMA_VERSION = lt_py38
 
 [testenv:project_tests]