docs(provider-tck): refresh the self-test count

The suite now ships the HTTP control client and its eighteen tests, so the count
this README quotes moved with it. Measured rather than added up: 196 passed, 21
skipped, 2 xfailed.

The table keeps both rows -- the client's tests and the report's -- because the
rebase that moved the client landed in the same region of this file as the
reporting section, and taking either side alone would have dropped a row that
still describes a real test module.

Signed-off-by: Simon Schrottner <simon.schrottner@flagsmith.com>

Author: aepfli

tools/openfeature-provider-tck/README.md

@@ -547,7 +547,7 @@ the field.
 
 ```
 | `test_http_control` | `HttpControl` | the `/reset` fallback, the disconnect bookkeeping and the control-API it reports, against a stubbed control API |
-PLACEHOLDER passed, 21 skipped, 2 xfailed
+196 passed, 21 skipped, 2 xfailed
 ```
 
 No Docker and no network. The conformance suites take under a second; `test_report`,