Formatting is not preserved after exploding imports

[johnspade]

If I have the following imports (formatted with spaces.inImportCurlyBraces = true in scalafmt, which adds spaces within the curly braces):

import bar.{ Bar => Baz, _ }

then scalafix removes the spaces within the curly braces:

import bar.{Bar => Baz, _}

I believe that this is the same issue as #127 but I have groupedImports = Explode in my scalafix config instead of Merge. I think that we should apply the fix from #127 to Explode as well.