Delete an unused import (#1744)

Author: ndmitchell

ghcide/src/Development/IDE/Core/FileStore.hs

@@ -67,7 +67,6 @@ import qualified Development.IDE.Types.Logger                 as L
 
 import qualified Data.Binary                                  as B
 import qualified Data.ByteString.Lazy                         as LBS
-import           Development.IDE.Core.IdeConfiguration        (isWorkspaceFile)
 import           Language.LSP.Server                          hiding
                                                               (getVirtualFile)
 import qualified Language.LSP.Server                          as LSP