Show writer mode icon by default

[gponsu]

I found it confusing that writing mode icon did not appear until I installed Metamask. Maybe it will appear disabled by default at the beginning.

I also think that this icon doesn't seem well what it is, I did not easily understand that by pushing it the mode of writing was activating.

[MiguelBel]

Hey @gponsu do you have in mind any icon? We use the https://materialdesignicons.com/ so feel free to suggest.

[gponsu]

If you give me a few days, I'll open PR with a proposal.

[MiguelBel]

Sure @gponsu !