Fix Filter add property button (#529)

Signed-off-by: Ayoub LABIDI <[email protected]>

Author: ayolab

src/components/filter/criteria-based/filter-free-properties.tsx

@@ -99,7 +99,7 @@ function FilterFreeProperties({
                 </ListItem>
             ))}
             <Grid item>
-                <Button startIcon={<AddIcon />} onClick={() => addNewProp}>
+                <Button startIcon={<AddIcon />} onClick={() => addNewProp()}>
                     <FormattedMessage id="AddFreePropCrit" />
                 </Button>
             </Grid>