consistent message

test/prefix.bats

@@ -25,7 +25,7 @@ load test_helper
 }
 
 #Arch has Python at sbin as well as bin
-@test "prefix for sbin system" {
+@test "prefix for system in sbin" {
   mkdir -p "${PYENV_TEST_DIR}/sbin"
   touch "${PYENV_TEST_DIR}/sbin/python"
   chmod +x "${PYENV_TEST_DIR}/sbin/python"