Remove unneeded interface IRunner

src/catch2/internal/catch_run_context.cpp

@@ -167,7 +167,6 @@ namespace Catch {
         m_lastAssertionInfo{ StringRef(), SourceLineInfo("",0), StringRef(), ResultDisposition::Normal },
         m_includeSuccessfulResults( m_config->includeSuccessfulResults() || m_reporter->getPreferences().shouldReportAllAssertions )
     {
-        m_context.setRunner(this);
         m_context.setResultCapture(this);
         m_reporter->testRunStarting(m_runInfo);
     }