fix indentation project wide

deltachat-ios.xcodeproj/project.pbxproj

@@ -257,7 +257,7 @@
 			indentWidth = 4;
 			sourceTree = "<group>";
 			tabWidth = 4;
-			usesTabs = 1;
+			usesTabs = 0;
 		};
 		7A9FB1411FB061E2001FEA36 /* Products */ = {
 			isa = PBXGroup;