Fixes a bug when switching context with shared core

Two contexts compared to one another will no longer take the
source_entity property into consideration. This causes problems with
context changes tied to context_from_path. Conceptually, it also makes
sense for two contexts representing the same location in the pipeline to
compare equal, regardless of what source_entity the context was
constructed from.

Author: mathurf

core/core_api.yml

@@ -14,4 +14,4 @@
 location:
   type: app_store
   name: tk-core
-  version: v0.18.109
+  version: v0.18.110