Change dependency check for battery_char function

themes/base.theme.bash

@@ -482,7 +482,9 @@ if ! command_exists battery_charge ; then
     }
 fi
 
-if ! command_exists battery_char ; then
+# The battery_char function depends on the presence of the battery_percentage function.
+# If battery_percentage is not defined, then define battery_char as a no-op.
+if ! command_exists battery_percentage ; then
     function battery_char (){
 	# no op
 	echo -n