Fix bullets like inkvine not falling down

Make bullets fall down by default

data/bullets.json

@@ -18,7 +18,6 @@
       }
     },
     "Falling": {
-      "FallsDown": true,
       "Bounces": true
     },
     "SeekFactor": -1

missions/custom/techdemo/cyberdogs.cdogscpn/bullets.json

@@ -166,8 +166,7 @@
         "Wall": {}
       },
       "Falling": {
-        "GravityFactor": 0.7,
-        "FallsDown": true
+        "GravityFactor": 0.7
       },
       "OutOfRangeGuns": [
         "blast_weak",

missions/most_classified_enemy.cdogscpn/guns.json

@@ -36,7 +36,6 @@
       "Sound": "hits/petrify",
       "HitsObjects": false,
       "Falling": {
-        "FallsDown": true,
         "DestroyOnDrop": true
       }
     },

src/cdogs/bullet_class.c

@@ -884,6 +884,7 @@ static void LoadBullet(
 	{
 		json_t *falling = json_find_first_label(node, "Falling")->child;
 		LoadFloat(&b->Falling.GravityFactor, falling, "GravityFactor");
+		b->Falling.FallsDown = true;
 		LoadBool(&b->Falling.FallsDown, falling, "FallsDown");
 		LoadBool(&b->Falling.DestroyOnDrop, falling, "DestroyOnDrop");
 		LoadBool(&b->Falling.Bounces, falling, "Bounces");