Fix TypedDictionary binding generation

[Grublady]

Currently, TypedDictionary bindings fail to generate correctly.

This issue has not been apparent so far because Godot has not exposed any API using TypedDictionary, but it makes CI checks fail on PRs such as godotengine/godot#104096 which do so.

This PR fixes the bindgen with two small tweaks:

• An off-by-one index is corrected
• Parenthesis are added to prevent macros from erroneously splitting arguments on the comma in TypedDictionary<KeyType, ValueType>

For convenience, here is an extension_api.json generated from the above PR. The issue is related to the typeddictionary:: entries.
extension_api.json

Fixes godotengine/godot#100137

[Zylann]

Wondered about it in #1162
Looks like it could also fix godotengine/godot#100137 ?

[dsnopek]

Thanks!

This looks good to me, and worked in some minimal testing. (Thanks for including the extension_api.json to make testing easier :-))

[dsnopek]

Cherry-picked for 4.4 in PR #1805