feat(sign): add automatic white background removal for signature images

Signed-off-by: Balázs Szücs <bszucs1209@gmail.com>

app/core/src/main/java/stirling/software/SPDF/config/InitialSetup.java

@@ -58,6 +58,7 @@ public class InitialSetup {
             applicationProperties.getAutomaticallyGenerated().setKey(secretKey);
         }
     }
+
     public void initLegalUrls() throws IOException {
         // Initialize Terms and Conditions
         String termsUrl = applicationProperties.getLegal().getTermsAndConditions();