Incorrect algorithm in preflightCheck

[demiazz]

Function preflightCheck ignore babel options as ignore or only.

If I ignore node_modules directory, and try compile code, plugin throw error on any file inside node_modules (in my case, I use rollup with karma, and have errors in deep-equal or jquery).

If the function uses current way for helpers existing, then the function must check file path with using only/ignore` options.

[Rich-Harris]

Shuold be fixed in 2.7.1 – thanks