hterm/nassh: add missing <meta charset=utf-8/> tag
hterm/nassh: add missing <meta charset=utf-8/> tag

Change-Id: I3b8d6cc690b08e1cd8c0d232423bf4cf7b1dd282
Reviewed-on: https://chromium-review.googlesource.com/c/apps/libapps/+/2200248
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Reviewed-by: Joel Hockey <9ecfc52dc2ffef73afac73f3495f294aeddf1231@chromium.org>

chromium/hterm,chromium/hterm,chromium/hterm,chromium/hterm