Fix for 7z viewer not showing folders

[DoozyDoz]

Description

• Upon opening a 7z compressed file in amaze, only files would be visible despite there existing folders too (as described in issue #3440 )

Issue tracker

Fixes #3440

Automatic tests

• [ ] Added test cases

Manual tests

• [x] Done

Build tasks success

Successfully running following tasks on local:

• [x] ./gradlew assembledebug
• [x] ./gradlew spotlessCheck

[VishalNehra]

Please run ./gradlew spotlessApply in local to fix the failing task.

[DoozyDoz]

Please run ./gradlew spotlessApply in local to fix the failing task.

Done

[VishalNehra]

Please check following test case failures

java.lang.AssertionError: Thrown from class com.amaze.filemanager.asynchronous.asynctasks.compress.SevenZipHelperCallableTest.name expected:<5> but was:<10>

com.amaze.filemanager.asynchronous.asynctasks.compress.SevenZipHelperCallableTest.testRoot[16] FAILED java.lang.AssertionError: expected:<1> but was:<2>

com.amaze.filemanager.asynchronous.asynctasks.compress.SevenZipHelperCallableTest.testRoot[19] FAILED java.lang.AssertionError: expected:<1> but was:<2>

com.amaze.filemanager.asynchronous.asynctasks.compress.SevenZipHelperCallableTest.testSublevels[19] FAILED java.lang.AssertionError: Thrown from class com.amaze.filemanager.asynchronous.asynctasks.compress.SevenZipHelperCallableTest.name expected:<5> but was:<10>

[TranceLove]

Superceded by #3981.

This PR had been left cold for quite a while with test fixtures didn't get fixed, hence had to make a new changeset based on ideas here.

Thank you again for your work.