Revert "Patch OneTuple to work around ghc/ghc#20562 on HEAD"

This reverts commit 460c708d.

patches/OneTuple-0.3.1.patch

-diff --git a/src/Data/Tuple/OneTuple.hs b/src/Data/Tuple/OneTuple.hs
-index 8700132..cb7feb0 100644
---- a/src/Data/Tuple/OneTuple.hs
-+++ b/src/Data/Tuple/OneTuple.hs
-@@ -21,7 +21,7 @@ import Data.Tuple.Solo
- type OneTuple = Solo
- 
- only :: OneTuple a -> a
--only = getSolo
-+only (Solo x) = x
- 
- #if __GLASGOW_HASKELL__ >= 708
- #if __GLASGOW_HASKELL__ >= 710