Raise CHUNK_SIZEs

[szaimen]

fix nextcloud/android#8398
Signed-off-by: szaimen szaimen@e.mail.de

[nextcloud-android-bot]

Lint

Type	master	PR
Warnings	1	2
Errors	0	0

SpotBugs (new)

Warning Type	Number
Bad practice Warnings	14
Correctness Warnings	38
Internationalization Warnings	6
Malicious code vulnerability Warnings	7
Multithreaded correctness Warnings	3
Performance Warnings	17
Security Warnings	1
Dodgy code Warnings	40
Total	126

SpotBugs (master)

Warning Type	Number
Bad practice Warnings	14
Correctness Warnings	38
Internationalization Warnings	6
Malicious code vulnerability Warnings	7
Multithreaded correctness Warnings	3
Performance Warnings	17
Security Warnings	1
Dodgy code Warnings	40
Total	126

Lint increased!

[tobiasKaminsky]

We will not change the default without any deeper knowledge if this is a good idea.
For other apps that use the library we could introduce a more flexible way, so that the apps can pass their desired chunk size.