Make console logs consistent and remove </input>

The Input Element has a self-closing tag.
I tried using the initial log syntax for console logs within go blocks and got a compiler warning:
```
WARNING: Use of undeclared Var async-tut1.core/log at line 50 src/async_tut1/core.cljs
```
So I think it's best to consistently use (.log js/console ...) since it works in all contexts.