utils: fix symlink handling in mesonRootDirs

[andrei8l]

Bitwise check for File or Directory type to properly handle symlinks of both

• Follow up for: Allow root meson.build files to be symlinks #208

Testing:

• symlinked root meson.build gets picked up automatically
• symlinked directory with meson.build appears in the Select configuration to use prompt if there's no root meson.build
• regular files and directories still work
• (symlinked) directory named meson.build doesn't get picked up as root configuration

Based on this sample.

[tristan957]

Looks like Prettier is failing for the PR. Can you check on that?

[tristan957]

Thanks for investigating!

[andrei8l]

Thanks for merging.