Disable SQLite WAL mode manually

Android P seems to default to WAL mode, we don't like it

src/main/java/com/topjohnwu/magisk/database/SuDatabaseHelper.java

@@ -53,6 +53,7 @@ public class SuDatabaseHelper {
     private SuDatabaseHelper(MagiskManager mm) {
         pm = mm.getPackageManager();
         mDb = openDatabase(mm);
+        mDb.disableWriteAheadLogging();
         int version = mDb.getVersion();
         if (version < DATABASE_VER) {
             onUpgrade(mDb, version);