web_tests: Fixing python3 discovery bug on my win machine

Change-Id: If0dfc3446fd697b950cb6db270fa85a52c90b63d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626969Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Eugene Zemtsov <eugene@chromium.org>
Cr-Commit-Position: refs/heads/master@{#843743}

third_party/blink/tools/blinkpy/web_tests/port/win.py

@@ -185,7 +185,7 @@ class WinPort(base.Port):
             try:
                 self._executive.run_command([python, '--version'])
                 return python
-            except WindowsError:
+            except:
                 pass
         raise WindowsError('Unable to find a valid python3 command name')