[jnigen] small fix for renaming constructors

[marshelino-maged]

• small fix for renaming constructors.

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[github-actions]

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pkgs/jni/lib/src/third_party/generated_bindings.dart
pkgs/objective_c/lib/src/ns_input_stream.dart

[HosseinYousefi]

LGTM!

[coveralls]

coverage: 87.936% (-0.006%) from 87.942%
when pulling e2a8795 on marshelino-maged:rename-constructor
into 6290151 on dart-lang:main.