rm unused urlparam

src/routes/weather/compare/[location]/+page.svelte

@@ -9,7 +9,7 @@
 	import { storedLocation, storedModel, storedUnits } from '$lib/stores/settings';
 
 	import { formatZoned } from '$lib/utils/date';
-	import { readList, syncSearchParams } from '$lib/utils/url-state';
+	import { listUnlessDefault, readList, syncSearchParams } from '$lib/utils/url-state';
 
 	import { ChartContainer, ChartToolbar } from '$lib/components/charts';
 	import { Checkbox } from '$lib/components/ui/checkbox';
@@ -71,10 +71,19 @@
 		storedLocation.set(data.location);
 	});
 
+	const DEFAULT_VARS = ['temperature_2m', 'rain', 'wind_speed_10m'];
+	const DEFAULT_MODELS = [
+		'ecmwf_ifs',
+		'meteofrance_seamless',
+		'ukmo_seamless',
+		'icon_seamless',
+		'gfs_seamless'
+	];
+
 	let params = $state({
 		...defaultParameters,
-		hourly: ['temperature_2m', 'rain', 'wind_speed_10m'],
-		models: ['ecmwf_ifs', 'meteofrance_seamless', 'ukmo_seamless', 'icon_seamless', 'gfs_seamless']
+		hourly: [...DEFAULT_VARS],
+		models: [...DEFAULT_MODELS]
 	});
 
 	// units live in a persisted store; mirror them into params so a change
@@ -125,8 +134,8 @@
 		const vars = params.hourly;
 		if (!mounted) return;
 		syncSearchParams(get(page).url, {
-			models: models?.length ? models.join(',') : null,
-			vars: vars?.length ? vars.join(',') : null
+			models: listUnlessDefault(models, DEFAULT_MODELS),
+			vars: listUnlessDefault(vars, DEFAULT_VARS)
 		});
 	});