Fix linter errors: trailing whitespace and missing space after keyword

Author: cgillum

azure/durable_functions/models/DurableOrchestrationContext.py

@@ -248,7 +248,7 @@ def call_http(self, method: str, uri: str, content: Optional[str] = None,
             The HTTP request uri.
         content: str or dict, optional
             The HTTP request content. Can be a string or a JSON-serializable dictionary.
-            Note: Although the type hint says 'str', a dictionary is accepted 
+            Note: Although the type hint says 'str', a dictionary is accepted
             and will be serialized to JSON.
         headers: Optional[Dict[str, str]]
             The HTTP request headers.

azure/durable_functions/models/TaskOrchestrationExecutor.py

@@ -276,7 +276,7 @@ def get_orchestrator_state_str(self) -> str:
             message contains in it the string representation of the orchestration's
             state
         """
-        if(self.output is not None):
+        if (self.output is not None):
             try:
                 # Attempt to serialize the output. If serialization fails, raise an
                 # error indicating that the orchestration output is not serializable,