gradle: Set continuous as the default build type

We cannot enable optimizations by default in debug builds, so simply set our new variant
as the default

Signed-off-by: Aayush Gupta <aayushgupta219@gmail.com>

Author: theimpulson

app/build.gradle.kts

@@ -99,6 +99,7 @@ configure<ApplicationExtension> {
             initWith(getByName("release"))
             applicationIdSuffix = ".continuous"
             signingConfig = signingConfigs.getByName("debug")
+            isDefault = true
         }
     }