Fixed Test Proxy Settings always reporting failure

targeted for SLE maintenance update
Yes, as long as it cannot be fixed in the editor, and the code is still readable.

Compare with https://github.com/yast/zombie-killer/commit/f3fb65783299136021bf44d4e08d8e603fc647c6 (which is easy to fix in the editor) and https://github.com/yast/zombie-killer/commit/224997d9d22e8705f9bac3e88ec3f477bf61de9c which addresses exactly this issue and which I previously tried in a less readable way.