fix: Fix querystring encoding

[jantimon]

fix #1355

fo:demonstration-path/very fancy+name.js?path=/home?value=abc&value=def#zzz
   ^            ^    ^    ^     ^    ^  ^    ^^    ^     ^   ^     ^   ^
   |            |    |    |     |    |  |    ||    |     |   |     |   |
encoded         |    |    encoded    |  |    ||    |     |   |     |   |
               ignored              ignored  ignored     ignored   ignored              

[zbigg]

Looks good too me.

filePath.indexOf('?');

If it would be me, i would use lastIndexOf but after few thoughts, cut-off on first ? looks like more currect and robust.