spl: reduce heap size

stratosphere/spl/source/spl_main.cpp

@@ -31,7 +31,7 @@ extern "C" {
 
     u32 __nx_applet_type = AppletType_None;
 
-    #define INNER_HEAP_SIZE 0x4000
+    #define INNER_HEAP_SIZE 0x2000
     size_t nx_inner_heap_size = INNER_HEAP_SIZE;
     char   nx_inner_heap[INNER_HEAP_SIZE];