tox: Remove pylint timeout

It's not a valid pylint config

Change-Id: Ida480429a3a86637f26e9fc3a0d6fa2d225d952a
Reviewed-on: https://gerrit-review.googlesource.com/c/git-repo/+/396921
Reviewed-by: Scott Lee <ddoman@google.com>
Commit-Queue: Josip Sokcevic <sokcevic@google.com>
Tested-by: Josip Sokcevic <sokcevic@google.com>
diff --git a/tox.ini b/tox.ini
index ed09200..d87fa4b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -58,6 +58,3 @@
 commands =
     black {posargs:.}
     flake8
-
-[pytest]
-timeout = 300