level_control: bump expected cluster revision 6 -> 7

Matter 1.5.1 §1.6 lists the LevelControl cluster at revision 7.
Upstream project-chip#453 bumped the local `validate()` check and the
`TestLevelControlDeviceLogic` reference impl from 5 to 6, but the
spec value is one higher. Bring both to 7 so device-side `validate()`
accepts spec-conformant cluster definitions.

Author: snabb

rs-matter/src/dm/clusters/app/level_control.rs

@@ -287,9 +287,9 @@ impl<'a, H: LevelControlHooks, OH: OnOffHooks> LevelControlHandler<'a, H, OH> {
     ///
     /// panics with error message if the `state`'s `CLUSTER` is misconfigured.
     fn validate(&self) {
-        if H::CLUSTER.revision != 6 {
+        if H::CLUSTER.revision != 7 {
             panic!(
-                "LevelControl validation: incorrect version number: expected 6 got {}",
+                "LevelControl validation: incorrect version number: expected 7 got {}",
                 H::CLUSTER.revision
             );
         }
@@ -1849,7 +1849,7 @@ pub mod test {
         const MAX_LEVEL: u8 = 254;
         const FASTEST_RATE: u8 = 50;
         const CLUSTER: Cluster<'static> = FULL_CLUSTER
-            .with_revision(6)
+            .with_revision(7)
             .with_features(Feature::ON_OFF.bits())
             .with_attrs(with!(
                 required;