Rename arena default allocation function

src/core/mem/arena/mem_arena.c

@@ -1,7 +1,6 @@
 #include "mem_arena.h"
 #include "aliases.h"
 #include "mem_utils.h"
-#include "misc_utils.h"
 #include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
@@ -27,8 +26,8 @@ struct arena {
 
 // PUBLIC API
 
-bool wapp_mem_arena_init(Arena **arena, u64 base_capacity, MemAllocFlags flags,
-                         bool zero_buffer) {
+bool wapp_mem_arena_init_custom(Arena **arena, u64 base_capacity,
+                                MemAllocFlags flags, bool zero_buffer) {
   if (!arena || *arena || base_capacity == 0) {
     return false;
   }