CEC-1256/CEC-1330 fixing filters length function (#137)

* fixing filters length function

* adding filters testing

* code smell

* code smells

* bug

src/components/Cars/Status/Details/__snapshots__/index.test.jsx.snap

@@ -76,7 +76,7 @@ exports[`VehicleDetailsTab Render 1`] = `
                     Filters
                   </b>
                   : 
-                  0
+                  3
                 </p>
               </div>
               <div

src/components/Cars/Status/Details/index.jsx

@@ -66,7 +66,7 @@ const MainForm = ({ vin }) => {
             <p><b>Max Memory Buffer Size</b>: {vehicle.canbus.max_mem_buffer_size ?? "Default"}</p>
             <p><b>Enabled</b>: {vehicle.canbus.data_logger_enabled.toString()}</p>
             <p><b>Max Disk Buffer Size</b>: {vehicle.canbus.max_disk_buffer_size ?? "Default"}</p>
-            <p><b>Filters</b>: {vehicle.canbus.filters ? vehicle.canbus.filters.length() : 0}</p>
+            <p><b>Filters</b>: {vehicle.canbus.filters ? vehicle.canbus.filters.length : 0}</p>
           </Grid>
         )}
         <Grid item md={12} className={classes.textCenterAlign}>