Add hidden setting to puzzles

#19

app/views/contests/scoreboard.html.slim

@@ -9,7 +9,7 @@ css:
 
 - if @contest.puzzles.size <= 1
   .row.small-screen-image style="display: none"
-    - @contest.puzzles.each do |puzzle|
+    - @puzzles.each do |puzzle|
       .d-flex.flex-column.justify-content-center.mb-5
         = image_tag(puzzle.image, style: "max-height: 200px; object-fit: contain") if puzzle.image.attached?
         .mt-2.fs-6 style="text-align: center"
@@ -54,7 +54,7 @@ css:
                   = contestant.display_time
     .col-1
     .col-5
-      - @contest.puzzles.each do |puzzle|
+      - @puzzles.each do |puzzle|
         = image_tag(puzzle.image, class: "img-fluid ms-3 me-3") if puzzle.image.attached?
         .mt-3.fs-4 style="margin-left: 15px"
           = puzzle.name
@@ -76,7 +76,7 @@ css:
               th
               th
               th
-              - @contest.puzzles.each do |puzzle|
+              - @puzzles.each do |puzzle|
                 th scope="col"
                   = image_tag(puzzle.image, class: "img-fluid", style: "max-height: 64px;") if puzzle.image.attached?
             tr
@@ -88,7 +88,7 @@ css:
                 = t("activerecord.attributes.contestant.completions")
               th scope="col"
                 = t("activerecord.attributes.contestant.display_time")
-              - @contest.puzzles.each do |puzzle|
+              - @puzzles.each do |puzzle|
                 th scope="col"
                   = puzzle.name
           tbody
@@ -102,7 +102,7 @@ css:
                   = contestant.completions.where(remaining_pieces: nil).length
                 td
                   = contestant.completions.size > 0 && contestant.completions[-1].remaining_pieces ? "#{contestant.completions.map{|completion| completion.puzzle.pieces}.sum - contestant.completions[-1].remaining_pieces}p" : contestant.display_time
-                - @contest.puzzles.each do |puzzle|
+                - @puzzles.each do |puzzle|
                   td
                     - contestant.completions.each do |completion|
                       - if completion.puzzle == puzzle