feat(web-app-template): Make use of WebAppIssue.isExcluded

This recently added property is `true` if and only if the related
corresponding package is excluded or if the corresponding non-null
affected path is excluded.

So, the exclusion filter in the issues tab as of this change handles
excluded affected paths of issues.

Signed-off-by: Frank Viernau <frank_viernau@epam.com>

plugins/reporters/web-app-template/src/components/IssuesTable.jsx

@@ -157,22 +157,20 @@ class IssuesTable extends React.Component {
                 filteredValue: filteredInfo.excludes || null,
                 key: 'excludes',
                 onFilter: (value, webAppOrtIssue) => {
-                    const webAppPackage = webAppOrtIssue.package;
-
                     if (value === 'excluded') {
-                        return webAppPackage.isExcluded;
+                        return webAppOrtIssue.isExcluded;
                     }
 
                     if (value === 'included') {
-                        return !webAppPackage.isExcluded;
+                        return !webAppOrtIssue.isExcluded;
                     }
 
                     return false;
                 },
                 render: (webAppOrtIssue) => {
                     const webAppPackage = webAppOrtIssue.package;
 
-                    return webAppPackage.isExcluded
+                    return webAppOrtIssue.isExcluded
                         ? (
                         <span className="ort-excludes">
                             <Tooltip