`textAsTa` was not properly handling uppercase alphanumerics. This would
break subsite authentication when there are uppercase characters in your
cookies.
Should now be equivalent to `(cury scot %t)`.
dojo:
```
> (scot %t 'urbauth-zod=0v2.d0q3n.4jgsq.fl9jk.mp2nd.97uu6; lang=en-US')
~.~~urbauth-zod~3d.0v2~.d0q3n~.4jgsq~.fl9jk~.mp2nd~.97uu6~3b..lang~3d.en-~55.~53.
```
ghci:
```
λ> textAsTa "urbauth-zod=0v2.d0q3n.4jgsq.fl9jk.mp2nd.97uu6; lang=en-US"
"~~urbauth-zod~3d.0v2~.d0q3n~.4jgsq~.fl9jk~.mp2nd~.97uu6~3b..lang~3d.en-~55.~53."
```
