refactor(build): remove unnecessary compose build feature configuration

Author: wmontwe

build-plugin/src/main/kotlin/thunderbird.app.android.compose.gradle.kts

@@ -16,10 +16,6 @@ android {
             )
         }
     }
-
-    buildFeatures {
-        compose = true
-    }
 }
 
 dependencies {

build-plugin/src/main/kotlin/thunderbird.library.android.compose.gradle.kts

@@ -9,14 +9,9 @@ plugins {
     id("thunderbird.quality.spotless")
 }
 
-android {
-    buildFeatures {
-        compose = true
-    }
-}
-
 androidComponents {
     beforeVariants(selector().withBuildType("release")) { variantBuilder ->
+        @Suppress("UnstableApiUsage")
         variantBuilder.hostTests[HostTestBuilder.UNIT_TEST_TYPE]?.enable = false
         variantBuilder.enableAndroidTest = false
     }