Fix: exchange test data with measurement in plot

Signed-off-by: Thomas Klaehn <thomas.klaehn@perinet.io>

webui/src/lib/Uplot.svelte

@@ -54,7 +54,7 @@
                 },
                 {
                     label: data_label,
-                    stroke: "red",
+                    stroke: "#b6b6b6",
                     paths: uPlot.paths.spline(),
                     value: (u, v, sidx, didx) => {
                         if (didx == null) {

webui/src/routes/sauna/+page.svelte

@@ -19,7 +19,7 @@
 			temperature_value = data.value
 			time = data.time.slice(11, 19)
 			if(plot) {
-				plot.add_data(Math.floor(Math.random() * 30) - 15);
+				plot.add_data(temperature_value);
 			}
 			updated = JSON.parse(data.valid);
 		}).catch(error => {