The jasmine types for `spyObj.calls().all()` seem to be more specific,
relying on `ThisType<Fn>` to determine the context/receiver for an invoked
spy. This type does not work as expected with class members as it seems.

This commit fixes three of these type checking failures by explicitly casting
the spy context to the actual class owning the method member.

Fixes an error in the satte-serializer spec:

```
devtools/projects/ng-devtools-backend/src/lib/state-serializer/state-serializer.spec.ts:103:60 - error TS2345: Argument of type '{ name: string; children: { name: string; children: { name: number; children: { name: number; children: { name: string; }[]; }[]; }[]; }[]; }[]' is not assignable to parameter of type 'NestedProp[]'.
  Type '{ name: string; children: { name: string; children: { name: number; children: { name: number; children: { name: string; }[]; }[]; }[]; }[]; }' is not assignable to type 'NestedProp'.
    Types of property 'children' are incompatible.
      Type '{ name: string; children: { name: number; children: { name: number; children: { name: string; }[]; }[]; }[]; }[]' is not assignable to type 'NestedProp[]'.
        Type '{ name: string; children: { name: number; children: { name: number; children: { name: string; }[]; }[]; }[]; }' is not assignable to type 'NestedProp'.
          Types of property 'children' are incompatible.
            Type '{ name: number; children: { name: number; children: { name: string; }[]; }[]; }[]' is not assignable to type 'NestedProp[]'.
              Type '{ name: number; children: { name: number; children: { name: string; }[]; }[]; }' is not assignable to type 'NestedProp'.
                Types of property 'children' are incompatible.
                  Type '{ name: number; children: { name: string; }[]; }[]' is not assignable to type 'NestedProp[]'.
                    Type '{ name: number; children: { name: string; }[]; }' is not assignable to type 'NestedProp'.
                      Types of property 'children' are incompatible.
                        Type '{ name: string; }[]' is not assignable to type 'NestedProp[]'.
                          Property 'children' is missing in type '{ name: string; }' but required in type 'NestedProp'.

103     const result = deeplySerializeSelectedProperties(dir1, QUERY_1_2);
```