simplify test_conftest_found_with_double_dash() test code
simplify test_conftest_found_with_double_dash() test code

hackebrot/pytest,nicoddemus/pytest,The-Compiler/pytest,tareqalayan/pytest,markshao/pytest,nicoddemus/pytest,tomviner/pytest,davidszotten/pytest,Akasurde/pytest,tomviner/pytest,pytest-dev/pytest,txomon/pytest,alfredodeza/pytest,rmfitzpatrick/pytest,The-Compiler/pytest,RonnyPfannschmidt/pytest,ddboline/pytest,pfctdayelise/pytest