Fix reversed Cancel and Close buttons

Buttons for "Are you sure you want to close the repository?" warning were reversed.
Now Cancel will leave the window, Close will close the window.

Author: lucasderraugh

GitUp/Application/Document.m

@@ -874,7 +874,7 @@ - (BOOL)shouldCloseDocument {
     [alert addButtonWithTitle:NSLocalizedString(@"Close", nil)];
     [alert addButtonWithTitle:NSLocalizedString(@"Cancel", nil)];
     alert.type = kGIAlertType_Caution;
-    if ([alert runModal] == NSAlertFirstButtonReturn) {
+    if ([alert runModal] == NSAlertSecondButtonReturn) {
       return NO;
     }
     _abortIndexing = YES;