Change default setting of "Default view level" from "Fit to width" to "Readable"...

Change default setting of "Default view level" from "Fit to width" to "Readable" in case of resetting to default

[Title] Change default setting of "Default view level" from "Fit to width" to "Readable" in case of resetting to default
[Issue#] N_SE-9857
[Problem] Fit to width is set as default browser setting in "Reset to default setting" against "Readable"
[Cause] It's assigned to set as Fit to width in step of browser resetting
[Solution] Change default setting of "Default view level" from "Fit to width" to "Readable" in case of resetting to default
[Team] Browser UI
[Developer] junghwan kang (junghwan.kang)
[Request] N/A

Change-Id: Ib645a1dc55524e566e2953af9ba1f7b06fabfaf4