Base+Snake: Capitalize snake skin names

In Snake, the menu for choosing a skin looked messy due to
inconsistent capitalization. Two skins names were entirely lowercase.
For the sprite-based skins, the menu takes the name of each skin's
directory, so I have capitalized these.

Capitalizing the original snake skin required more change than simply
renaming a directory.

Userland/Games/Snake/Game.cpp

@@ -68,7 +68,7 @@ ErrorOr<NonnullRefPtr<Game>> Game::try_create()
     }
 
     auto color = Color::from_argb(Config::read_u32("Snake"sv, "Snake"sv, "BaseColor"sv, Color(Color::Green).value()));
-    auto skin_name = Config::read_string("Snake"sv, "Snake"sv, "SnakeSkin"sv, "classic"sv);
+    auto skin_name = Config::read_string("Snake"sv, "Snake"sv, "SnakeSkin"sv, "Classic"sv);
     auto skin = TRY(SnakeSkin::create(skin_name, color));
 
     return adopt_nonnull_ref_or_enomem(new (nothrow) Game(move(food_bitmaps), color, skin_name, move(skin)));

Userland/Games/Snake/Skins/SnakeSkin.cpp

@@ -14,7 +14,7 @@ namespace Snake {
 
 ErrorOr<NonnullOwnPtr<SnakeSkin>> SnakeSkin::create(StringView skin_name, Color color)
 {
-    if (skin_name == "classic"sv)
+    if (skin_name == "Classic"sv)
         return try_make<ClassicSkin>(color);
 
     // Try to find an image-based skin matching the name.

Userland/Games/Snake/main.cpp

@@ -59,7 +59,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     game.set_focus(true);
 
     auto high_score = Config::read_u32("Snake"sv, "Snake"sv, "HighScore"sv, 0);
-    auto snake_skin_name = Config::read_string("Snake"sv, "Snake"sv, "SnakeSkin"sv, "classic"sv);
+    auto snake_skin_name = Config::read_string("Snake"sv, "Snake"sv, "SnakeSkin"sv, "Classic"sv);
 
     auto& statusbar = *widget->find_descendant_of_type_named<GUI::Statusbar>("statusbar"sv);
     statusbar.set_text(0, "Score: 0"sv);
@@ -110,7 +110,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         if (!was_paused)
             game.start();
     });
-    change_snake_color->set_enabled(snake_skin_name == "classic"sv);
+    change_snake_color->set_enabled(snake_skin_name == "Classic"sv);
     TRY(game_menu->try_add_action(change_snake_color));
 
     GUI::ActionGroup skin_action_group;
@@ -137,7 +137,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
         TRY(add_skin_action(entry.name, false));
         return IterationDecision::Continue;
     }));
-    TRY(add_skin_action("classic"sv, true));
+    TRY(add_skin_action("Classic"sv, true));
 
     TRY(game_menu->try_add_separator());
     TRY(game_menu->try_add_action(GUI::CommonActions::make_quit_action([](auto&) {