fix: unable to use askar with in memory db

Signed-off-by: Daniel Bluhm <dbluhm@pm.me>

Author: dbluhm

aries_cloudagent/askar/store.py

@@ -146,7 +146,7 @@ async def open_store(self, provision: bool = False) -> "AskarOpenStore":
         """
 
         try:
-            if provision:
+            if provision or self.in_memory:
                 store = await Store.provision(
                     self.get_uri(create=True),
                     self.key_derivation_method,