fix manifest removing last entry

gradle.properties

@@ -1,2 +1,2 @@
 version_base=1.0
-version_patch=8
+version_patch=9

src/main/java/com/hypherionmc/modfusioner/actions/JarMergeAction.java

@@ -594,7 +594,7 @@ public class JarMergeAction {
                     }
                     sb.append(line).append("\n");
                 }
-                FileUtils.write(file, sb.toString().trim(), StandardCharsets.UTF_8);
+                FileUtils.write(file, sb.toString(), StandardCharsets.UTF_8);
             }
         }
     }