battery: revert battery charging symbol 1-character-width hack

Fixes #8804

plugins/battery/battery.plugin.zsh

@@ -175,7 +175,7 @@ function battery_level_gauge() {
   local filled_symbol=${BATTERY_GAUGE_FILLED_SYMBOL:-'▶'}
   local empty_symbol=${BATTERY_GAUGE_EMPTY_SYMBOL:-'▷'}
   local charging_color=${BATTERY_CHARGING_COLOR:-$color_yellow}
-  local charging_symbol=${BATTERY_CHARGING_SYMBOL:-'%{%G⚡%}'}
+  local charging_symbol=${BATTERY_CHARGING_SYMBOL:-'⚡'}
 
   local battery_remaining_percentage=$(battery_pct)
   local filled empty gauge_color