Enable Element Call integration in rooms by default (#1685)

Also change base url to `call.element.dev`.

libraries/featureflag/api/src/main/kotlin/io/element/android/libraries/featureflag/api/FeatureFlags.kt

@@ -59,7 +59,7 @@ enum class FeatureFlags(
         key = "feature.elementcall",
         title = "Element call in rooms",
         description = "Allow user to start or join a call in a room",
-        defaultValue = false,
+        defaultValue = true,
     ),
     Mentions(
         key = "feature.mentions",

libraries/featureflag/impl/src/main/kotlin/io/element/android/libraries/featureflag/impl/StaticFeatureFlagProvider.kt

@@ -37,7 +37,7 @@ class StaticFeatureFlagProvider @Inject constructor() :
                 FeatureFlags.NotificationSettings -> true
                 FeatureFlags.VoiceMessages -> true
                 FeatureFlags.PinUnlock -> false
-                FeatureFlags.InRoomCalls -> false
+                FeatureFlags.InRoomCalls -> true
                 FeatureFlags.Mentions -> false
             }
         } else {

libraries/featureflag/test/src/main/java/io/element/android/libraries/featureflag/test/FakeFeatureFlagService.kt

@@ -31,6 +31,6 @@ class FakeFeatureFlagService(
     }
 
     override suspend fun isFeatureEnabled(feature: Feature): Boolean {
-        return enabledFeatures[feature.key] ?: feature.defaultValue
+        return enabledFeatures[feature.key] ?: false
     }
 }