MT#21751 fix test fail introduced at 2d34ec796

> # Failure: Unexpected action call expire(table: 0x2247140,"431110001",7200), expected:
> call expire(table: 0x2247140,"9bcb88b6-541a-43da-8fdc-816f5557ff93",7200) => 1
> # Ran 3 tests in 0.001 seconds, 2 successes, 1 failures

* recentcalls rename set_by_uuid to set_by_key

Change-Id: I9bf3cc8f3174e0aafc7f243a5edf3134d0bc5afd

tests/ngcp_recentcalls.lua

@@ -87,7 +87,7 @@ TestNGCPRecentCalls = {} --class
                                  "caller", caller,
                                  "callee", callee,
                                  "source", source) ;mc :returns(true)
-        self.central:expire(uuid, ttl) ;mc :returns(1)
+        self.central:expire(key, ttl) ;mc :returns(1)
 
         mc:replay()
         local res = self.rcalls:set_by_key(key,