cleanup(cgpt): Remove ext4 and partition searching support from resize

The patch this code required to suport PARTTYPE in blkid was never
accepted, also since switching to btrfs a wrapper script has used lsblk
which did get support for PARTTYPE. Drop the call to resize2fs.
Merge pull request #17 from marineam/cleanup

cleanup(cgpt): Remove ext4 and partition searching support from resize