Fix bug in ANBU that cause wrong total time showing on Queries tab

When query time is larger than one second 'array_sum' cannot convert it
to float right. Also, it is better to fire 'laravel.query' event with
raw time as an argument rather than its string representation
Merge pull request #1663 from neoascetic/anbu_fix

Fix bug in ANBU that cause wrong total time showing on SQL tab