Remove redundant _defaultFormatOptions field (#1038590)
Remove redundant _defaultFormatOptions field (#1038590)

Related: rhbz#1038590

Ext2FS extends FS, which already sets _defaultFormatOptions to [].

rvykydal/blivet,rhinstaller/blivet,rvykydal/blivet,jkonecny12/blivet,dwlehman/blivet,jkonecny12/blivet,rhinstaller/blivet,AdamWill/blivet,vpodzime/blivet,vpodzime/blivet,AdamWill/blivet,vojtechtrefny/blivet,vojtechtrefny/blivet,dwlehman/blivet