fix: spellbooks can have infinite charges (#38376)

* fix: spellbooks can have infinite charges

* refactor: indicate infinite spellbook charges with null

Not sure if I like this much better...

Resources/Prototypes/Entities/Objects/Magic/books.yml

@@ -69,7 +69,7 @@
   components:
     - type: Spellbook
       spellActions:
-        ActionSpawnMagicarpSpell: -1
+        ActionSpawnMagicarpSpell: null
 
 - type: entity
   id: ForceWallSpellbook
@@ -92,7 +92,7 @@
         color: gold
     - type: Spellbook
       spellActions:
-        ActionForceWall: -1
+        ActionForceWall: null
 
 - type: entity
   id: BlinkBook
@@ -113,7 +113,7 @@
         color: gold
     - type: Spellbook
       spellActions:
-        ActionBlink: -1
+        ActionBlink: null
 
 - type: entity
   id: SmiteBook
@@ -136,7 +136,7 @@
       - state: overlay_blood
     - type: Spellbook
       spellActions:
-        ActionSmiteNoReq: -1
+        ActionSmiteNoReq: null
 
 - type: entity
   id: KnockSpellbook
@@ -158,7 +158,7 @@
         color: "#98c495"
     - type: Spellbook
       spellActions:
-        ActionKnock: -1
+        ActionKnock: null
 
 - type: entity
   id: FireballSpellbook
@@ -182,7 +182,7 @@
         shader: unshaded
     - type: Spellbook
       spellActions:
-        ActionFireball: -1
+        ActionFireball: null
 
 - type: entity
   id: ScrollRunes
@@ -197,7 +197,7 @@
     - state: spell_default
   - type: Spellbook
     spellActions:
-      ActionFlashRune: -1
-      ActionExplosionRune: -1
-      ActionIgniteRune: -1
-      ActionStunRune: -1
+      ActionFlashRune: null
+      ActionExplosionRune: null
+      ActionIgniteRune: null
+      ActionStunRune: null