Do not close PW in BlurUtils dump

Kotlin use will close the Closeable after finishing the block. This
would close the underlying PW, preventing dumping the rest in SystemUI.

Test: adb shell dumpsys activity service
com.android.systemui/.SystemUIService dependency
Fixes: 149947072

Change-Id: I52d62a47589384a17616fdbb4c0f7e897dedc8ee