Pull up signed in and username properties from EditButton to TournamentPage

This makes us able to provide these fields in lower components without having to
rebind the state to the properties of this component.
This will be needed to restrct access to the modal allowing the user to modify scores.

pages/tournament.js

@@ -31,16 +31,17 @@ import {
     verifyCredentials
 } from '../js/api';
 
-class TournamentPage extends React.Component {
+class PrivateTournamentPage extends React.Component {
 
     render() {
         const { id, description, isPublic, code, ownerUsername, playoffStages } = this.props.tournament;
+        const { isSignedIn, username } = this.props;
         
         // TODO: Change href-prop of the anchor tag to contain the tournament code
         return (
             <div className='pb-5'>
                 <Container>
-                    <EditButton id={id} ownerName={ownerUsername}/>
+                    <EditButton id={id} ownerName={ownerUsername} isSignedIn={isSignedIn} username={username}/>
                     <p>{description}</p>
                     <ListGroup>
                         <ListGroupItem>
@@ -59,7 +60,16 @@ class TournamentPage extends React.Component {
     }
 }
 
-function PrivateEditButton(props) {
+function mapStateToTournamentPageProperties(state) {
+    const { isSignedIn, username } = state.userinfo;
+    return { isSignedIn, username };
+}
+
+const TournamentPage = connect(
+    mapStateToTournamentPageProperties
+)(PrivateTournamentPage);
+
+function EditButton(props) {
     const { id, ownerName, isSignedIn, username } = props;
 
     if(isSignedIn && ownerName === username) {
@@ -71,15 +81,6 @@ function PrivateEditButton(props) {
     }
 }
 
-function mapStateToEditButtonProperties(state) {
-    const { isSignedIn, username } = state.userinfo;
-    return { isSignedIn, username };
-}
-
-const EditButton = connect(
-    mapStateToEditButtonProperties
-)(PrivateEditButton);
-
 function getLevelName(levelNumber) {
     const names = ['Finale', 'Halbfinale', 'Viertelfinale', 'Achtelfinale'];
     if(levelNumber < names.length){