Rename the workflow.

Currently the GHA badge reads: "run tests passing".
This should change it to "tests passing".

.github/workflows/tests.yml

@@ -1,4 +1,4 @@
-name: run tests
+name: tests
 
 on:
   push:

README.rst

@@ -10,8 +10,8 @@
         :target: https://pypi.org/project/zope.browser/
         :alt: Supported Python versions
 
-.. image:: https://github.com/zopefoundation/zope.browser/workflows/run%20tests/badge.svg
-        :target: https://github.com/zopefoundation/zope.browser/actions?query=workflow%3A%22run+tests%22
+.. image:: https://github.com/zopefoundation/zope.browser/workflows/tests/badge.svg
+        :target: https://github.com/zopefoundation/zope.browser/actions?query=workflow%3A%22tests%22
 
 .. image:: https://coveralls.io/repos/github/zopefoundation/zope.browser/badge.svg?branch=master
         :target: https://coveralls.io/github/zopefoundation/zope.browser?branch=master