Bug 1546100 - [tryselect] Fix tools/tryselect/test/test_fuzzy.py, r=jmaher

This was regressed by bug 1544816 but the test never ran on the push that regressed.
This patch also updates the 'files-changed' for the tryselect task.

Differential Revision: https://phabricator.services.mozilla.com/D28386

--HG--
extra : moz-landing-system : lando

taskcluster/ci/source-test/python.yml

@@ -247,4 +247,6 @@ tryselect:
         subsuite: try
     when:
         files-changed:
+            - 'taskcluster/ci/test/**'
+            - 'taskcluster/taskgraph/transforms/**'
             - 'tools/tryselect/**'

tools/tryselect/test/test_fuzzy.py

@@ -23,7 +23,7 @@ def test_paths(run_mach, capfd):
     # with the path filtering.
     expected = """
     "tasks": [
-        "test-linux64/opt-xpcshell-1proc-1"
+        "test-linux64/opt-xpcshell-e10s-1"
     ]""".lstrip()
 
     assert expected in output