Correctly identify sticker picker widgets
Correctly identify sticker picker widgets

Widgets added to account data have the `type` of "m.widget", meaning we have to look at the `content.type` which will tell us what it is. 

This also fixes a bug where all user widgets become sticker picker widgets under the right conditions.

Signed-off-by: Travis Ralston <f36f6a6abc4b55589c96c71fceedf83e596b8f33@gmail.com>
matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,aperezdc/matrix-react-sdk,aperezdc/matrix-react-sdk,matrix-org/matrix-react-sdk,matrix-org/matrix-react-sdk,aperezdc/matrix-react-sdk,aperezdc/matrix-react-sdk