rounds denars when displayed to nearest 50 (#167)

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## Describe Your Changes

create rounding function and call it in both cases we display denars

## Non-Obvious Technical Information

Notice we currently don't store this in the database. 

## Checklist Before Requesting a Review
- [X] The code runs successfully.

```commandline
HERE IS SOME COMMAND LINE OUTPUT
```

prijateli_tree/app/routers/administration.py

@@ -33,7 +33,11 @@
     SessionLocal,
     User,
 )
-from prijateli_tree.app.utils.administration import Hasher, show_network
+from prijateli_tree.app.utils.administration import (
+    Hasher,
+    round_denars,
+    show_network,
+)
 from prijateli_tree.app.utils.constants import (
     DENAR_FACTOR,
     KEY_LOGIN_SECRET,
@@ -149,6 +153,10 @@ def dashboard(
     sessions = db.query(GameSession).all()
     students = db.query(User).filter_by(role=ROLE_STUDENT).all()
     session_players = db.query(GameSessionPlayer).all()
+
+    for sp in session_players:
+        sp.denars = round_denars(sp.points, DENAR_FACTOR)
+
     student_dict = {}
     for s in students:
         student_dict[s.id] = s
@@ -169,7 +177,6 @@ def dashboard(
             "students": students,
             "student_dict": student_dict,
             "session_players": session_players,
-            "DENAR_FACTOR": DENAR_FACTOR,
         },
     )
 

prijateli_tree/app/routers/games.py

@@ -22,6 +22,7 @@
     User,
     get_db,
 )
+from prijateli_tree.app.utils.administration import round_denars
 from prijateli_tree.app.utils.constants import (
     DENAR_FACTOR,
     FILE_MODE_READ,
@@ -674,7 +675,7 @@ def end_of_session(
     # Get points and won games from session player
     total_points = session_player.points
     n_correct_answers = session_player.correct_answers
-    denars = int(total_points * DENAR_FACTOR)
+    denars = round_denars(total_points, DENAR_FACTOR)
 
     template_text = languages[get_lang_from_player_id(player_id, db)]
 

prijateli_tree/app/templates/administration/admin_dashboard.html

@@ -122,7 +122,7 @@ <h2>List of Awards</h2>
                   <td>{{ sp.user.first_name + ' ' + sp.user.last_name }}</td>
                   <td>{{ sp.correct_answers }}</td>
                   <td>{{ sp.points }}</td>
-                  <td>{{ sp.points * DENAR_FACTOR }}</td>
+                  <td>{{ sp.denars }}</td>
                 </tr>
               {% endfor %}
             </tbody>

prijateli_tree/app/utils/administration.py

@@ -24,3 +24,8 @@ def verify_password(plain_password, hashed_password):
     @staticmethod
     def get_password_hash(password):
         return pwd_context.hash(password)
+
+
+def round_denars(points, denar_factor):
+    denar = points * denar_factor
+    return round(denar * 0.02) * 50