Add set clickable false after clear click listener

Enter inspector activity, back to home and switch to files again.
Inspector text will become clickable.
Although it set null to click listener, it will set clickable
to true automatically. Add set clickable false after clear click
listener.

Fix: 123209419
Test: manual
Test: DocumentsUIGoogleTests
Change-Id: I8c0a41e50445744d3c2e0901f4df2658710d2164