Ignore directory entries in TPZ

Zip files may contain directory entries, they always end with a path
separator and zip entries always use forward slashes for path separators.

There's no need to create the directories included in the zip file,
since they'll already be created when creating the individual files.

(cherry picked from commit 59a5a1eb70)

editor/export/export_template_manager.cpp

@@ -466,6 +466,13 @@ bool ExportTemplateManager::_install_file_selected(const String &p_file, bool p_
 			break;
 		}
 
+		if (String::utf8(fname).ends_with("/")) {
+			// File is a directory, ignore it.
+			// Directories will be created when extracting each file.
+			ret = unzGoToNextFile(pkg);
+			continue;
+		}
+
 		String file_path(String::utf8(fname).simplify_path());
 
 		String file = file_path.get_file();