Address some build warnings and cleanup (#1412)

core/common/build.gradle.kts

@@ -6,10 +6,11 @@ plugins {
 
 android {
     namespace = "eu.kanade.tachiyomi.core.common"
+}
 
-    kotlinOptions {
-        freeCompilerArgs += listOf(
-            "-Xcontext-receivers",
+kotlin {
+    compilerOptions {
+        freeCompilerArgs.addAll(
             "-opt-in=kotlinx.coroutines.ExperimentalCoroutinesApi",
             "-opt-in=kotlinx.serialization.ExperimentalSerializationApi",
         )

core/common/src/main/kotlin/eu/kanade/tachiyomi/util/system/WebViewUtil.kt

@@ -68,7 +68,6 @@ fun WebView.setDefaultSettings() {
     with(settings) {
         javaScriptEnabled = true
         domStorageEnabled = true
-        databaseEnabled = true
         useWideViewPort = true
         loadWithOverviewMode = true
         cacheMode = WebSettings.LOAD_DEFAULT