Python: Minor cleanup to snippets

As pointed out in review, we don't need this override any more!

Author: RasmusWL

python/.vscode/ql.code-snippets

@@ -180,8 +180,6 @@
             "",
             "  /** A direct instantiation of `${TM_SELECTED_TEXT}`. */",
             "  private class ClassInstantiation extends InstanceSource, DataFlow::CallCfgNode {",
-            "      override CallNode node;",
-            "",
             "      ClassInstantiation() { this = classRef().getACall() }",
             "  }",
             "",

python/ql/lib/semmle/python/frameworks/Django.qll

@@ -322,8 +322,6 @@ private module Django {
 
     /** A direct instantiation of `django.utils.datastructures.MultiValueDict`. */
     private class ClassInstantiation extends InstanceSource, DataFlow::CallCfgNode {
-      override CallNode node;
-
       ClassInstantiation() { this = classRef().getACall() }
     }