Proper sed options

Jenkinsfile

@@ -84,7 +84,7 @@ node('docker && ubuntu-16.04') {
 			cd proto1
 			ls -l
 			cp project.godot project.godot.backup
-			sed -e 's/GLES3/GLES2/g' -f -i project.godot
+			sed -e 's/GLES3/GLES2/g' -i project.godot
 			cat project.godot
 			${base}/godot-templates/godot_server.x11.tools.64 --export "HTML5" ${base}/proto1-html/index.html
 			cp project.godot.backup project.godot