Fix tower quicksave bug (only appeared in some builds)

I ran the game through Valgrind to catch various issues.
One thing caught my attention -- map.resumedelay. This is
used by The Tower/etc to add a delay before the game is
resumed (probably for camera controls delaying it) for
spawning the player. This variable was uninitialized. Notably,
if I explicitly set it to 592851 or similar, it reproduces the
bug, even if I cannot reproduce it with my typical compilation
flags. So fixing this by initializing it to 0, alongside some
other Valgrind warnings, should fix the problem entirely.

desktop_version/src/Entity.h

@@ -219,7 +219,7 @@ public:
     std::vector<int> customcollect;
 
     int nblocks;
-    bool skipblocks, skipdirblocks;
+    bool skipblocks = false, skipdirblocks;
 
     int platformtile;
     bool vertplatforms, horplatforms;