Fix some wrongly used constants in module.c (#8844)

This change does not fix any bugs.
1. ```moduleUnload``` should return ```C_OK``` or ```C_ERR```, not ```REDISMODULE_ERR``` or ```REDISMODULE_OK```.
2. The ```where``` parameter of ```listTypePush``` and ```listTypePop``` should be ```LIST_HEAD``` or ```LIST_TAIL```

src/module.c

@@ -2566,7 +2566,7 @@ int RM_ListPush(RedisModuleKey *key, int where, RedisModuleString *ele) {
     if (key->value && key->value->type != OBJ_LIST) return REDISMODULE_ERR;
     if (key->value == NULL) moduleCreateEmptyKey(key,REDISMODULE_KEYTYPE_LIST);
     listTypePush(key->value, ele,
-        (where == REDISMODULE_LIST_HEAD) ? QUICKLIST_HEAD : QUICKLIST_TAIL);
+        (where == REDISMODULE_LIST_HEAD) ? LIST_HEAD : LIST_TAIL);
     return REDISMODULE_OK;
 }
 
@@ -2583,7 +2583,7 @@ RedisModuleString *RM_ListPop(RedisModuleKey *key, int where) {
         key->value == NULL ||
         key->value->type != OBJ_LIST) return NULL;
     robj *ele = listTypePop(key->value,
-        (where == REDISMODULE_LIST_HEAD) ? QUICKLIST_HEAD : QUICKLIST_TAIL);
+        (where == REDISMODULE_LIST_HEAD) ? LIST_HEAD : LIST_TAIL);
     robj *decoded = getDecodedObject(ele);
     decrRefCount(ele);
     moduleDelKeyIfEmpty(key);
@@ -8589,16 +8589,16 @@ int moduleUnload(sds name) {
 
     if (module == NULL) {
         errno = ENOENT;
-        return REDISMODULE_ERR;
+        return C_ERR;
     } else if (listLength(module->types)) {
         errno = EBUSY;
-        return REDISMODULE_ERR;
+        return C_ERR;
     } else if (listLength(module->usedby)) {
         errno = EPERM;
-        return REDISMODULE_ERR;
+        return C_ERR;
     } else if (module->blocked_clients) {
         errno = EAGAIN;
-        return REDISMODULE_ERR;
+        return C_ERR;
     }
 
     /* Give module a chance to clean up. */
@@ -8614,7 +8614,7 @@ int moduleUnload(sds name) {
         if (unload_status == REDISMODULE_ERR) {
             serverLog(LL_WARNING, "Module %s OnUnload failed.  Unload canceled.", name);
             errno = ECANCELED;
-            return REDISMODULE_ERR;
+            return C_ERR;
         }
     }
 
@@ -8647,7 +8647,7 @@ int moduleUnload(sds name) {
     module->name = NULL; /* The name was already freed by dictDelete(). */
     moduleFreeModuleStructure(module);
 
-    return REDISMODULE_OK;
+    return C_OK;
 }
 
 /* Helper function for the MODULE and HELLO command: send the list of the