ksys/act: rename the actor accessor to ActorLinkConstDataAccess

The 0x18-sized accessor appears to be named ActorLinkConstDataAccess
based on a source path string in the Wii U build. The 0x10-sized
base class (which we had given the name to) only holds a BaseProc and
its dtor/acquire functions live in a separate TU so let's rename it
BaseProcAccessor (unofficial name).

acquireActor is a header inline whose one copy landed in the BeamBase
object. Nothing in BeamBase calls it, so the BeamBase function that used
it was probably dead-stripped by the linker.

(AI assisted using Claude Opus 5.5)

src/KingSystem/ActorSystem/actActorSystem.h

@@ -6,7 +6,7 @@
 
 namespace ksys::act {
 
-class ActorConstDataAccess;
+class ActorLinkConstDataAccess;
 
 // TODO: incomplete
 class ActorSystem {
@@ -16,7 +16,7 @@ class ActorSystem {
 public:
     void onBaseProcMgrCalc();
 
-    bool getPlayer(ActorConstDataAccess* accessor);
+    bool getPlayer(ActorLinkConstDataAccess* accessor);
 
     bool getAutoPlacementActorPos(const sead::SafeString& name, sead::Vector3f* pos) const;