[cleanup] [presubmit] Remove non-existing cpplint category

The readability/streams category is gone since
https://codereview.chromium.org/777533005.

R=machenbach@chromium.org

Bug: v8:6921
Change-Id: If0e0f978275ad20278ccedcdd607c31ae30d3133
Reviewed-on: https://chromium-review.googlesource.com/720925Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Clemens Hammacher <clemensh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48585}

tools/presubmit.py

@@ -62,7 +62,6 @@ LINT_RULES = """
 -build/include_what_you_use
 -readability/check
 -readability/fn_size
-+readability/streams
 -runtime/references
 """.split()