display: Fix reported humidity.

display/firmware/src/display.rs

             (data.temperature % 10).abs()
         )
         .ok();
-        write!(
-            strings.hum,
-            "{},{}%",
-            data.humidity / 10,
-            data.humidity % 10
-        )
-        .ok();
+        let humidity = (data.humidity + 5) / 10;
+        write!(strings.hum, "{},{}%", humidity / 10, humidity % 10).ok();
         strings
     }
 

display/firmware/src/sensors.rs

         spi,
         BME280Data {
             temperature: (values.temperature * 10.0) as i32,
-            humidity: (values.humidity * 10.0) as u32,
+            humidity: (values.humidity * 100.0) as u32,
             pressure: values.pressure as u32,
         },
     )