avoid insertWith' depreaction warning

Switch to Data.Map.Strict everywhere that used it.

There are still lots of lazy maps in git-annex. I think switching these
is safe. The risk is that there might be a map that is used in a way
that relies on the values not being evaluated to WHNF, and switching to
strict might result in bad performance or memory use. So, I have not
switched everything.

Assistant/TransferQueue.hs

@@ -35,7 +35,7 @@ import Annex.Wanted
 import Utility.TList
 
 import Control.Concurrent.STM
-import qualified Data.Map as M
+import qualified Data.Map.Strict as M
 import qualified Data.Set as S
 
 type Reason = String
@@ -198,7 +198,7 @@ getNextTransfer acceptable = do
 				if acceptable info
 					then do
 						adjustTransfersSTM dstatus $
-							M.insertWith' const t info
+							M.insert t info
 						return $ Just r
 					else return Nothing