Assume definedness of current configuration in HB when falling back (#…

…421)

When falling back to Kore, take advantage of the fact initial rewriting
state is defined, the fact that Booster preserves definiteness and a new
feature in `kore-rpc` that assumes definedness of the execution state
(see runtimeverification/haskell-backend#3705).

---------

Co-authored-by: Jost Berthold <[email protected]>

tools/booster/Proxy.hs

@@ -277,6 +277,7 @@ respondEither cfg@ProxyConfig{statsVar, boosterState} booster kore req = case re
                                             r
                                                 { state = execStateToKoreJson simplifiedBoosterState
                                                 , maxDepth = Just $ Depth 1
+                                                , assumeStateDefined = Just True
                                                 }
                                         )
                             when (isJust statsVar) $ do