Enable unzip by default

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

@@ -1440,7 +1440,7 @@ public class FragmentOptionsDisplay extends FragmentBase implements SharedPrefer
         swImagesPlaceholders.setChecked(prefs.getBoolean("image_placeholders", true));
         swImagesInline.setChecked(prefs.getBoolean("inline_images", false));
         swButtonExtra.setChecked(prefs.getBoolean("button_extra", false));
-        swUnzip.setChecked(prefs.getBoolean("unzip", false));
+        swUnzip.setChecked(prefs.getBoolean("unzip", true));
         swAttachmentsAlt.setChecked(prefs.getBoolean("attachments_alt", false));
         swThumbnails.setChecked(prefs.getBoolean("thumbnails", true));
 

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

@@ -3377,7 +3377,7 @@ public class MessageHelper {
 
                 else if ("application/zip".equals(local.type)) {
                     SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
-                    boolean unzip = prefs.getBoolean("unzip", false);
+                    boolean unzip = prefs.getBoolean("unzip", true);
 
                     if (unzip) {
                         // https://developer.android.com/reference/java/util/zip/ZipInputStream