[MRESOURCES-301] nonFilteredFileExtension not taken into account

**[Patrick Reinhart](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=reinhapa)** opened **[MRESOURCES-301](https://issues.apache.org/jira/browse/MRESOURCES-301?redirect=false)** and commented

Specified

```java
jar
```

not taken into account.

Eventhough specified within the config block the extension `jar` is not taken into account:

Debug output:

```java
...
[DEBUG] Copying file border8.png
[DEBUG] file border8.png has a non filtered file extension
[DEBUG] Using 'UTF-8' encoding to copy filtered resource 'border8.png'.
[DEBUG] copy /home/pr/git/izpack/izpack/izpack-dist/src/main/resources/border8.png to /home/pr/git/izpack/izpack/izpack-dist/target/classes/border8.png
[DEBUG] Copying file lib/kunststoff.jar
[DEBUG] file kunststoff.jar has a filtered file extension
[DEBUG] Using 'UTF-8' encoding to copy filtered resource 'kunststoff.jar'.
[DEBUG] filtering /home/pr/git/izpack/izpack/izpack-dist/src/main/resources/lib/kunststoff.jar to /home/pr/git/izpack/izpack/izpack-dist/target/classes/lib/kunststoff.jar
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary for IzPack dist module 5.2.1-SNAPSHOT:
[INFO]
[INFO] IzPack dist module ................................. FAILURE [ 0.884 s]
[INFO] IzPack install/uninstall test listeners ............ SKIPPED
[INFO] IzPack test module ................................. SKIPPED
[INFO] IzPack aggregated reports .......................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 5.075 s
[INFO] Finished at: 2023-09-19T20:04:08+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-resources-plugin:3.3.1:resources (default-cli) on project izpack-dist: filtering /home/pr/git/izpack/izpack/
```

I woud expect the kunststoff.jar has a **non** filtered file extension...

---

**Affects:** 3.3.1

**Issue Links:**
- [MRESOURCES-82](https://issues.apache.org/jira/browse/MRESOURCES-82) nonFilteredFileExtension does not work for exluding files during filter