Revert "Require inline for inline text"

This reverts commit 8dbf37884f.

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

@@ -5119,7 +5119,7 @@ public class MessageHelper {
 
             String ct = contentType.getBaseType();
             if (("text/plain".equalsIgnoreCase(ct) || "text/html".equalsIgnoreCase(ct)) &&
-                    Part.INLINE.equalsIgnoreCase(disposition) &&
+                    !Part.ATTACHMENT.equalsIgnoreCase(disposition) &&
                     (size <= MAX_MESSAGE_SIZE || size == Integer.MAX_VALUE)) {
                 parts.text.add(new PartHolder(part, contentType));
             } else {