fix(MatrixRTCSession): replace no-arg .finally() with .then(fn, fn) to fix crash on React Native / Hermes#5307

JeanLuX wants to merge 2 commits intomatrix-org:developmatrix-org/matrix-js-sdk:developfrom

JeanLuX:fix/matrixrtc-no-arg-promise-finallyJeanLuX/matrix-js-sdk:fix/matrixrtc-no-arg-promise-finallyCopy head branch name to clipboard