fix(plc4j/codegen): fixed typo in write data time

code-generation/language-java/src/main/java/org/apache/plc4x/language/java/JavaLanguageTemplateHelper.java

@@ -508,7 +508,7 @@ public String getDataWriterCall(SimpleTypeReference simpleTypeReference) {
             case DATE:
                 return "writeDate(writeBuffer)";
             case DATETIME:
-                return "writeDateTime(readBuffer)";
+                return "writeDateTime(writeBuffer)";
             default:
                 throw new UnsupportedOperationException("Unsupported type " + simpleTypeReference.getBaseType());
         }