Use the correct sender key when checking shared secret (#2730) (#2731)
Use the correct sender key when checking shared secret (#2730) (#2731)

(cherry picked from commit 890a8406857f88fc071d0ea98496f0290ec80768)

Co-authored-by: Hubert Chathi <9b9e95e9bf06161efedeb89fad8c81160622c875@matrix.org>
matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk,matrix-org/matrix-js-sdk