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

* fixing filters length function

* adding filters testing

* code smell

* code smells

* bug

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

@@ -83,7 +83,7 @@ exports[`FleetDetailsTab Render 1`] = `
                     Filters
                   </b>
                   : 
-                  0
+                  3
                 </p>
               </div>
               <div

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

@@ -67,7 +67,7 @@ const MainForm = ({ name }) => {
             <p><b>Max Memory Buffer Size</b>: {fleet.canbus.max_mem_buffer_size ?? "Default"}</p>
             <p><b>Enabled</b>: {fleet.canbus.data_logger_enabled.toString()}</p>
             <p><b>Max Disk Buffer Size</b>: {fleet.canbus.max_disk_buffer_size ?? "Default"}</p>
-            <p><b>Filters</b>: {fleet.canbus.filters ? fleet.canbus.filters.length() : 0}</p>
+            <p><b>Filters</b>: {fleet.canbus.filters ? fleet.canbus.filters.length : 0}</p>
           </Grid>
         )}
         <Grid item md={12} className={classes.textCenterAlign}>

src/components/Fleets/Status/__snapshots__/DetailsTab.test.jsx.snap

@@ -92,7 +92,7 @@ exports[`DetailsTab Render 1`] = `
                       Filters
                     </b>
                     : 
-                    0
+                    3
                   </p>
                 </div>
                 <div

src/components/Fleets/Status/__snapshots__/index.test.jsx.snap

@@ -179,7 +179,7 @@ exports[`FleetStatus Render 1`] = `
                             Filters
                           </b>
                           : 
-                          0
+                          3
                         </p>
                       </div>
                       <div

src/components/Fleets/Table/__snapshots__/index.test.jsx.snap

@@ -285,7 +285,7 @@ exports[`FleetTable Render 1`] = `
                   <td
                     class="MuiTableCell-root MuiTableCell-body MuiTableCell-alignCenter"
                   >
-                    0
+                    3
                   </td>
                 </tr>
                 <tr