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 e264ae20d2 and
fceb64827e.

(cherry picked from commit f13207254c)

core/script_language.cpp

@@ -31,8 +31,6 @@
 #include "script_language.h"
 
 #include "core/core_string_names.h"
-#include "core/io/resource_loader.h"
-#include "core/os/file_access.h"
 #include "core/project_settings.h"
 
 ScriptLanguage *ScriptServer::_languages[MAX_LANGUAGES];
@@ -168,7 +166,7 @@ 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"]);
 			}