fix: FileVersion: remove duplicate getters

[AlvaroBrey]

These getters are generated by Lombok; so it's failing to compile. Test before/after with
gw clean :library:compileDebugJavaWithJavac --no-build-cache

Introduced by #651, not sure how we missed it there

[github-actions]

SpotBugs (new)

Warning Type	Number
Bad practice Warnings	9
Correctness Warnings	35
Internationalization Warnings	6
Malicious code vulnerability Warnings	43
Multithreaded correctness Warnings	3
Performance Warnings	12
Security Warnings	1
Dodgy code Warnings	31
Total	140

SpotBugs (master)

Warning Type	Number
Bad practice Warnings	9
Correctness Warnings	35
Internationalization Warnings	6
Malicious code vulnerability Warnings	43
Multithreaded correctness Warnings	3
Performance Warnings	12
Security Warnings	1
Dodgy code Warnings	31
Total	140

[tobiasKaminsky]

As we want to remove lombok, I think it is better to replace this, with either data class, or with plain Java right now.
Especial this 0 for getFileLength() would otherwise be lost.

[github-actions]

SpotBugs (new)

Warning Type	Number
Bad practice Warnings	9
Correctness Warnings	35
Internationalization Warnings	6
Malicious code vulnerability Warnings	43
Multithreaded correctness Warnings	3
Performance Warnings	12
Security Warnings	1
Dodgy code Warnings	31
Total	140

SpotBugs (master)

Warning Type	Number
Bad practice Warnings	9
Correctness Warnings	35
Internationalization Warnings	6
Malicious code vulnerability Warnings	43
Multithreaded correctness Warnings	3
Performance Warnings	12
Security Warnings	1
Dodgy code Warnings	31
Total	140

[github-actions]

SpotBugs (new)

Warning Type	Number
Bad practice Warnings	9
Correctness Warnings	35
Internationalization Warnings	6
Malicious code vulnerability Warnings	43
Multithreaded correctness Warnings	3
Performance Warnings	12
Security Warnings	1
Dodgy code Warnings	31
Total	140

SpotBugs (master)

Warning Type	Number
Bad practice Warnings	9
Correctness Warnings	35
Internationalization Warnings	6
Malicious code vulnerability Warnings	43
Multithreaded correctness Warnings	3
Performance Warnings	12
Security Warnings	1
Dodgy code Warnings	31
Total	140