Allow configure() on an idle SDK instance (#63)

The assert was inverted: it rejected the empty (idle) status its message
says is required, so any debug app calling configure() on a fresh
instance crashed at startup.

Author: rayliverified

lib/src/codelessly.dart

@@ -332,7 +332,7 @@ class Codelessly {
     initErrorLogger();
 
     assert(
-      status is! CEmpty,
+      status is CEmpty || status is CConfigured,
       'The SDK cannot be configured if it is not idle. '
       'Consider calling [Codelessly.dispose] before reconfiguring.',
     );