Fix ConcatReader.close() to close all readers on failure

[iamsanjaymalakar]

This PR makes ConcatReader.close() exception-safe in both com.stardust.io.ConcatReader and org.autojs.autojs.io.ConcatReader.

Problem
If closing one underlying Reader throws an IOException, close() exits early and the remaining readers are never closed.

Fix
Close all readers in the queue, collect the first IOException, suppress subsequent close failures, and throw after cleanup is complete.