refactor: validatePathInput (#27)

- changed into a guard function instead of if expression.

src/UmuReactBasic/Types.hs

@@ -28,10 +28,9 @@ fromPathInput :: PathInput -> Text
 fromPathInput ( PathInput txt ) = txt
 
 validatePathInput :: Text -> Either PathInputError PathInput
-validatePathInput txt =
-  if FP.isValid $ T.unpack txt
-  then Right $ PathInput txt
-  else Left PathInputError
+validatePathInput txt
+  | FP.isValid $ T.unpack txt = Right $ PathInput txt
+  | otherwise = Left PathInputError
 
 newtype ComponentName = ComponentName Text
   deriving ( Eq, Show )