revert evergreen run-tests.sh change

queryable encryption doesn't run there (at least for now).

Author: timgraham

.evergreen/run-tests.sh

@@ -6,7 +6,6 @@ set -eux
 /opt/python/3.10/bin/python3 -m venv venv
 . venv/bin/activate
 python -m pip install -U pip
-pip install ".[encryption]"
 pip install -e .
 
 # Install django and test dependencies