Revert "Check if global class file still exists before registering it"

And revert follow-up regression fix "Remap script path when registering class."

After the regression fix, the original issue is valid again so it's better
to go back to the previous state.

This reverts commits e264ae20d2a828201a50868b3af334a3f8c8a37c and
fceb64827ea50364f34f4ba9db3910602d1911bf.

core/script_language.cpp

@@ -33,8 +33,6 @@
 #include "core/core_string_names.h"
 #include "core/debugger/engine_debugger.h"
 #include "core/debugger/script_debugger.h"
-#include "core/io/resource_loader.h"
-#include "core/os/file_access.h"
 #include "core/project_settings.h"
 
 #include <stdint.h>
@@ -164,7 +162,7 @@ void ScriptServer::init_languages() {
 
 			for (int i = 0; i < script_classes.size(); i++) {
 				Dictionary c = script_classes[i];
-				if (!c.has("class") || !c.has("language") || !c.has("path") || !FileAccess::exists(ResourceLoader::path_remap(c["path"])) || !c.has("base")) {
+				if (!c.has("class") || !c.has("language") || !c.has("path") || !c.has("base")) {
 					continue;
 				}
 				add_global_class(c["class"], c["base"], c["language"], c["path"]);