drop the unused msc4429 feature from ruma-common

the filter code it gates lives in ruma-client-api, so the declaration in
ruma-common was dead and the unused-feature lint failed on it.

Signed-off-by: June Strawberry <june@girlboss.ceo>

Author: x86pup

crates/ruma-client-api/Cargo.toml

@@ -59,7 +59,7 @@ unstable-msc4186 = ["ruma-common/unstable-msc4186"]
 unstable-msc4195 = ["unstable-msc4143"]
 # Profile Updates Sliding Sync Extension
 unstable-msc4262 = ["ruma-common/unstable-msc4262"]
-unstable-msc4429 = ["ruma-common/unstable-msc4429"]
+unstable-msc4429 = []
 unstable-msc4265 = []
 unstable-msc4266 = []
 unstable-msc4293 = ["ruma-events/unstable-msc4293"]

crates/ruma-common/Cargo.toml

@@ -46,7 +46,6 @@ unstable-msc4140 = []
 unstable-msc4186 = []
 # Profile Updates Sliding Sync Extension
 unstable-msc4262 = []
-unstable-msc4429 = []
 # Thread subscriptions.
 unstable-msc4306 = []
 # Secure out-of-band channel for QR code sign in

crates/ruma/Cargo.toml

@@ -202,7 +202,7 @@ unstable-msc4186 = ["ruma-common/unstable-msc4186", "ruma-client-api?/unstable-m
 unstable-msc4195 = ["unstable-msc4143", "ruma-client-api?/unstable-msc4195"]
 unstable-msc4203 = ["ruma-appservice-api?/unstable-msc4203"]
 unstable-msc4262 = ["ruma-common/unstable-msc4262", "ruma-client-api?/unstable-msc4262"]
-unstable-msc4429 = ["ruma-common/unstable-msc4429", "ruma-client-api?/unstable-msc4429"]
+unstable-msc4429 = ["ruma-client-api?/unstable-msc4429"]
 unstable-msc4265 = ["ruma-client-api?/unstable-msc4265"]
 unstable-msc4266 = ["ruma-client-api?/unstable-msc4266"]
 unstable-msc4268 = ["ruma-events?/unstable-msc4268"]