Fix round to 0 or 1 in capacity computation with given full-at

src/modules/battery.cpp

@@ -119,7 +119,7 @@ const std::tuple<uint8_t, float, std::string> waybar::modules::Battery::getInfos
     if (config_["full-at"].isUInt()) {
       auto full_at = config_["full-at"].asUInt();
       if (full_at < 100) {
-        capacity = static_cast<float>(capacity / full_at) * 100;
+        capacity = 100.f * capacity / full_at;
         if (capacity > full_at) {
           capacity = full_at;
         }