Resolve responseType name conflict in Angular Typescript lib

[grking8]

Rename variable so it does not clash with responseType parameter which is required for OAuth2 -
fixes #5853

CC @TiFu (2017/07) @taxpon (2017/07) @sebastianhaas (2017/07) @kenisteward (2017/07) @Vrolijkx (2017/09) @macjohnny (2018/01) @topce (2018/10) @akehir (2019/07) @petejohansonxo (2019/11) @amakhrov (2020/02)

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[macjohnny]

LGTM

[macjohnny]

@grking8 this PR was reverted in #9214, see the comment in #5853 (comment)

could you please file it again with the fix applied?

[grking8]

@grking8 this PR was reverted in #9214, see the comment in #5853 (comment)

could you please file it again with the fix applied?

Submitted #9216 @macjohnny