Replace update_option() calls with option_${option_name} filter hooks

[cjg89]

Update all explicit update_option() calls to check the existing option value before forcing an update to prevent excessive db calls. (We do this in a few places to force some default plugin options for this theme.)

See UCF/UCF-WordPress-Theme@4b24998

Examples:
https://github.com/UCF/Main-Site-Theme/blob/master/includes/ucf-alert-functions.php#L83-L85