Increased default sqlite cache size

app/src/main/java/eu/faircode/email/DB.java

@@ -121,7 +121,7 @@ public abstract class DB extends RoomDatabase {
     private static DB sInstance;
 
     static final int DEFAULT_QUERY_THREADS = 4; // AndroidX default thread count: 4
-    static final int DEFAULT_CACHE_SIZE = 5; // percentage
+    static final int DEFAULT_CACHE_SIZE = 10; // percentage
 
     private static final String DB_NAME = "fairemail";
     private static final int DB_CHECKPOINT = 1000; // requery/sqlite-android default

app/src/main/res/layout/fragment_options_misc.xml

@@ -704,7 +704,7 @@
                     android:id="@+id/sbSqliteCache"
                     android:layout_width="0dp"
                     android:layout_height="wrap_content"
-                    android:max="20"
+                    android:max="50"
                     android:min="0"
                     android:progress="5"
                     app:layout_constraintEnd_toEndOf="parent"