JAMES-2644 ContentTypeCleaner: add a test with a parameter

This was obviously missing...
diff --git a/server/container/core/src/test/java/org/apache/james/server/core/ContentTypeCleanerTest.java b/server/container/core/src/test/java/org/apache/james/server/core/ContentTypeCleanerTest.java
index c1d1bf1..26b46ce 100644
--- a/server/container/core/src/test/java/org/apache/james/server/core/ContentTypeCleanerTest.java
+++ b/server/container/core/src/test/java/org/apache/james/server/core/ContentTypeCleanerTest.java
@@ -52,4 +52,12 @@
                 .cleanContentType(null, contentType))
                 .isEqualTo(contentType);
     }
+
+    @Test
+    void shouldSupportParameters() {
+        String contentType = "application/pdf; filename=\"abc.pdf\"";
+        assertThat(ContentTypeCleaner
+            .cleanContentType(null, contentType))
+            .isEqualTo(contentType);
+    }
 }