Update unfocused cursor to match current cursor style #2455
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Fixes #2356.
Block cursor (unchanged)
When terminal is unfocused, it shows a outline of the block cursor.
Underline and bar cursors
When terminal is unfocused, it shows the underline or bar cursor. It always showed the outlined block cursor prior to this change.
Additional Change
This change revealed an unintended behaviour where if blinking is enabled and terminal is not focused, changing the cursor style did not update screen's cursor. A second change was made to force a refresh after options have changed regardless of whether blinking is enabled.
Tests
I tested unfocusing the terminal with all three styles and all three renderers (DOM, Canvas, WebGL) and verified proper cursor behaviour.