Simplify saving / loading hannah's state

src/Session.hs

@@ -24,19 +24,15 @@ data State =
 stateFile :: FilePath
 stateFile = libDir </> "state"
 
-ifM :: IO Bool -> IO a -> IO a -> IO a
-ifM condition caseTrue caseFalse =
-  condition >>= (\b -> if b then caseTrue else caseFalse)
-
 initial :: IO State
 initial = do
   createDirectoryIfMissing True libDir
-  ifM (doesFileExist stateFile)
-    (do
+  fileExists <- doesFileExist stateFile
+  if fileExists
+  then do
     playerID <- read <$> readFile stateFile
     return $ Connected {playerID, games = Map.empty}
-    )
-    (return New)
+  else return New
 
 store :: PlayerID -> IO ()
 store = writeFile stateFile . show