Rebuild SmartspaceSection on configuration changes

I also fixed an issue where the textSize of the default clock wouldn't
propegate to the rendered glyphs as expected, despite the space changing
size correctly.

Bug: 333752998
Test: Manual + Presumbits
Flag: com.android.systemui.migrate_clocks_to_blueprint
Change-Id: I3470b817292e5df60754a83590581ebb72e42b9c