Enable cursor drag by default for editable TextViews

Bug: 143852764
Bug: 145535274
Test: Manual and ran tests
  atest FrameworksCoreTests:EditorCursorDragTest
  atest FrameworksCoreTests:TextViewActivityTest
  atest FrameworksCoreTests:TextViewActivityMouseTest
Change-Id: I19ec46194a2ee9926070010b85f45c12135c950b
1 file changed