tpl/tplimpl: Change resources.GetRemote errors to suppressible warnings

[jmooring]

Affects these shortcodes:

• tpl/tplimpl/embedded/templates/_shortcodes/twitter.html
• tpl/tplimpl/embedded/templates/_shortcodes/twitter_simple.html
• tpl/tplimpl/embedded/templates/_shortcodes/x.html
• tpl/tplimpl/embedded/templates/_shortcodes/x_simple.html
• tpl/tplimpl/embedded/templates/_shortcodes/vimeo_simple.html

We already emit suppressible warnings with 404s. We need to do the same with other errors. This was an oversight when I reworked these shortcodes a few months ago.

Reference: https://discourse.gohugo.io/t/i-got-an-error-with-hugo-server-locally/55079

[github-actions]

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