Draw explosions and gas inside tunnel cells

Remove the is_hidden_in_tunnel() checks from Explosion.draw() and
Gas.draw() so explosions and gas clouds remain visible when their center
falls inside a tunnel cell. Logic already spawned them in tunnel cells,
but they were rendered invisible because the draw path returned early.

units/bomb.py

@@ -169,9 +169,6 @@ class Explosion(Bomb):
         x_pos = self.position_before[0] * self.game.cell_size + (self.game.cell_size - image_size[0]) // 2 + partial_x
         y_pos = self.position_before[1] * self.game.cell_size + (self.game.cell_size - image_size[1]) // 2 + partial_y
 
-        if self.is_hidden_in_tunnel(image_size):
-            return
-
         self.game.render_engine.draw_image(x_pos, y_pos, image, anchor="nw", tag="unit")
 
 

units/gas.py

@@ -75,10 +75,8 @@ class Gas(Unit):
         
         x_pos = self.position_before[0] * self.game.cell_size + (self.game.cell_size - image_size[0]) // 2 + partial_x
         y_pos = self.position_before[1] * self.game.cell_size + (self.game.cell_size - image_size[1]) // 2 + partial_y
-        if not self.is_hidden_in_tunnel(image_size):
         self.game.render_engine.draw_image(x_pos, y_pos, image, anchor="nw", tag="unit")
         for cell in self.spreading_cells:
             x_pos = cell[0] * self.game.cell_size + (self.game.cell_size - image_size[0]) // 2 + partial_x
             y_pos = cell[1] * self.game.cell_size + (self.game.cell_size - image_size[1]) // 2 + partial_y
-            if not self.is_hidden_in_tunnel(image_size, position=cell):
             self.game.render_engine.draw_image(x_pos, y_pos, image, anchor="nw", tag="unit")