Use NotFound instead of Forbidden for missing account data (#1872)
Use NotFound instead of Forbidden for missing account data (#1872)

Signed-off-by: Adam Greig <0e18f44c1fec03ec4083422cb58ba6a09ac4fb2a@adamgreig.com>
matrix-org/dendrite,matrix-org/dendrite,matrix-org/dendrite,matrix-org/dendrite