Correct the working directory for Emscripten PyRepl tests

[freakboy3742]

An update to #624 - it looks like the issue was the working directory not including the OOT build prefix.

[encukou]

Got SSH to prod so I used it.

Build https://buildbot.python.org/#/builders/1810/builds/412 used the config. from this PR.
The build/Tools shows up in PWD, but Buildbot is still trying to use /bin/run_test.sh. (Looks like some over-eager normalization throws away the ./ too early.)

Now trying with:

--- a/master/custom/factories.py
+++ b/master/custom/factories.py
@@ -1396,7 +1396,7 @@ class EmscriptenBuild(BaseBuild):
             Test(
                 name="PyRepl in Chrome smoke test",
                 command=[
-                    "./run_test.sh",
+                    "build/Tools/wasm/emscripten/browser_test/run_test.sh",
                 ],
                 env=compile_environ,
                 timeout=step_timeout(self.test_timeout),

[encukou]

This one should work.

[encukou]

I assume the Playwright error should be solved by installing deps on the worker:

    ╔══════════════════════════════════════════════════════╗
    ║ Host system is missing dependencies to run browsers. ║
    ║ Please install them with the following command:      ║
    ║                                                      ║
    ║     sudo npx playwright install-deps                 ║
    ║                                                      ║
    ║ Alternatively, use apt:                              ║
    ║     sudo apt-get install libatk1.0-0\                ║
    ║         libatk-bridge2.0-0\                          ║
    ║         libatspi2.0-0\                               ║
    ║         libxcomposite1\                              ║
    ║         libxdamage1\                                 ║
    ║         libgbm1\                                     ║
    ║         libxkbcommon0                                ║
    ║                                                      ║
    ║ <3 Playwright Team                                   ║
    ╚══════════════════════════════════════════════════════╝

[freakboy3742]

@encukou I've installed the dependencies on the worker; and it looks like we've got a clean build! Thanks for the debugging work on this.