Rename hasContentInLeftMargin

Switch to a more accurate name, since we need this to be false for
conversations even if they do, in fact, have content in the left
margin. The purpose of this param is essentially to skipp setting the
special top margin for aligning the content under the top line view.

Bug: 378660052
Flag: android.app.notifications_redesign_templates
Test: builds
Change-Id: I7891c5c55bd37b075f1c025c819f05b7cd22d540