model: fix copypasta bug using JSON in Literal desirialization

Tests will appear in the next commit. I don't find it usefull
to add the tests here.

Author: filak-sap

CHANGELOG.md

@@ -12,6 +12,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ### Changed
 - both Literal and JSON DateTimes has Timezone set to UTC - Jakub Filak
 
+### Fixed
+- use correct type of deserialization of Literal (URL) structure values - Jakub Filak
 
 ## [1.4.0]
 

pyodata/v2/model.py

@@ -551,7 +551,7 @@ def from_json(self, value):
         return EdmStructTypeSerializer.from_json(self._edm_type, value)
 
     def from_literal(self, value):
-        return EdmStructTypeSerializer.from_json(self._edm_type, value)
+        return EdmStructTypeSerializer.from_literal(self._edm_type, value)
 
 
 class EnumTypTrait(TypTraits):