[FIX]PluginGauge Resolving issue of giving wrong value to the gauge

Description

Updating the plugin gauge the gauge value params is giving wrong value because it was digit so if you want to calculate pourcentage 30% of 40 for example it should give you 77.5 but the plugin will give you 775

Steps to test

create a wiki page and add a plugin gauge within https://doc.tiki.org/PluginGauge try to pass a float value for example 16.5 and max of 100 with the old it will give you a black color meaning wrong value or a wrong calculation but with the new it should give the right calculation