Fixing removeUnreachable not searching in all blocks

[Away-pp]

The method removeUnreachableBlocks was iterating through all the methods basic blocks but only keeping the last result found (in toRemove).

This will create an error later when the method checkForUnreachableBlocks is called.

Therefore, the fix is to use only one instance of the object toRemove and keep all the information there.

[skylot]

@Away-pp thanks! It is a very stupid mistake 😭
Although, removing unreachable blocks is a bad idea in most cases because it is just hiding blocks processing issues.
I will try to review such approach and remove only real dead code on a very early stages before jadx do any changes to blocks tree.

[Away-pp]

I understand that there are other issues with unreachable blocks, but I think that maintaining this function is ok, not a big issue.
This commit was the first part to fix a specific decompilation problem (will make the pull request later).

By the way, I don`t think it was a stupid mistake. It just happens.

Thank you for the quick review.