eknWebview: Update WebView's default font size on DPI changes
eknWebview: Update WebView's default font size on DPI changes

Ensure that the default-font-size and default-monospace-font-size
properties in the WebKitSettings are adjusted to the current screen
resolution for font handling, causing the text to look smaller or bigger
depending on that (e.g. when enabling the "Larger Text" a11y option).

[endlessm/eos-sdk#2769]

endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib,endlessm/eos-knowledge-lib