Underlining errors can be off

[jeromesimeon]

Describe the bug

Underlining is sometimes off due to \t characters.

To Reproduce

Example:

bash-3.2$ ./packages/ergo-cli/bin/ergorun.js init ./examples/volumediscount/model.cto ./examples/volumediscount/logic.ergo --contract ./examples/volumediscount/contract.json --warnings  
./packages/ergo-cli/bin/ergorun.js init ./examples/volumediscount/model.cto ./examples/volumediscount/logic.ergo --contract ./examples/volumediscount/contract.json --warnings  
19:03:14 - warn: Warning (at file ./examples/volumediscount/logic.ergo line 20 col 2). No else in enforce
    enforce true;
  ^^^^^^^^^^^^^

Expected behavior

Clearer underlining:

bash-3.2$ ./packages/ergo-cli/bin/ergorun.js init ./examples/volumediscount/model.cto ./examples/volumediscount/logic.ergo --contract ./examples/volumediscount/contract.json --warnings  
./packages/ergo-cli/bin/ergorun.js init ./examples/volumediscount/model.cto ./examples/volumediscount/logic.ergo --contract ./examples/volumediscount/contract.json --warnings  
19:03:14 - warn: Warning (at file ./examples/volumediscount/logic.ergo line 20 col 2). No else in enforce
  enforce true;
  ^^^^^^^^^^^^^

[jeromesimeon]

Fixed in #627