fix blast projectile for rearranged checks

updatedshmup.p8

@@ -1166,21 +1166,32 @@ blast = {
  damage = 4,
  dx = 0,  -- px/frame
  dy = 2,
+ awaitcancel = false,
 
  -- disable damage for 2 frames
  -- when hitting something
  hitship = function(self, _)
-  self.damage = 0
-  local wait = 2
+  if self.damage > 0 and not self.awaitcancel then
+   self.awaitcancel = true
    events:push_back{move = function()
-   wait -= 1
-   if wait <= 0 then
-    self.damage = 4
+    new_events:push_back{
+     wait = 2,
+     obj = self,
+     saved_dmg = self.damage,
+     move = function(self)
+      self.wait -= 1
+      if self.wait <= 0 then
+       self.obj.damage = self.saved_dmg
        return true
       end
-   return false
+     end,
+    }
+    self.damage = 0
+    self.awaitcancel = false
+    return true
    end}
   end
+ end
 }
 blast_t = {
  __index = blast