Don't limit file name length to 30 letters

[andj207]

My app need to create a file with a longer name than 30, and it is stripped out and has no file extension.

[manaspratap]

Hey @andj207, until PR 36 is merged, you could override it like below:

dependency_overrides:
   file_picker_writable:
     git:
       url: https://github.com/manaspratap/file_picker_writable