Bugfix: load cave tiles correctly

* Cave_t should have defaults to true values
* Read lit status correctly

src/save.cpp

@@ -818,10 +818,10 @@ bool loadGame(bool *generate) {
                     goto error;
                 }
                 c_ptr->feature_id = (uint8_t) (char_tmp & 0xF);
-                c_ptr->perma_lit_room = (char_tmp >> 4) != 0;
-                c_ptr->field_mark = (char_tmp >> 5) != 0;
-                c_ptr->permanent_light = (char_tmp >> 6) != 0;
-                c_ptr->temporary_light = (char_tmp >> 7) != 0;
+                c_ptr->perma_lit_room = (bool) ((char_tmp >> 4) & 0x1);
+                c_ptr->field_mark = (bool) ((char_tmp >> 5) & 0x1);
+                c_ptr->permanent_light = (bool) ((char_tmp >> 6) & 0x1);
+                c_ptr->temporary_light = (bool) ((char_tmp >> 7) & 0x1);
                 c_ptr++;
             }
             total_count += count;

src/types.h

@@ -312,10 +312,10 @@ typedef struct {
     uint8_t treasure_id; // ID for any treasure item occupying the tile
     uint8_t feature_id;  // ID of cave feature; walls, floors, open space, etc.
 
-    bool perma_lit_room;  // Room should be lit with perm light, walls with this set should be perm lit after tunneled out.
-    bool field_mark;      // Field mark, used for traps/doors/stairs, object is hidden if fm is false.
-    bool permanent_light; // Permanent light, used for walls and lighted rooms.
-    bool temporary_light; // Temporary light, used for player's lamp light,etc.
+    bool perma_lit_room  : 1; // Room should be lit with perm light, walls with this set should be perm lit after tunneled out.
+    bool field_mark      : 1; // Field mark, used for traps/doors/stairs, object is hidden if fm is false.
+    bool permanent_light : 1; // Permanent light, used for walls and lighted rooms.
+    bool temporary_light : 1; // Temporary light, used for player's lamp light,etc.
 } Cave_t;