FindPython: fix handling when FIND_VIRTUALENV == FIRST

Fixes: #20525

Modules/FindPython/Support.cmake

@@ -953,7 +953,7 @@ if ("Interpreter" IN_LIST ${_PYTHON_PREFIX}_FIND_COMPONENTS)
           if (_${_PYTHON_PREFIX}_EXECUTABLE)
             break()
           endif()
-          if (NOT _${_PYTHON_PREFIX}_FIND_VIRTUALENV STREQUAL "ONLY")
+          if (_${_PYTHON_PREFIX}_FIND_VIRTUALENV STREQUAL "ONLY")
             break()
           endif()
         endif()