code-style: don't indent switch cases (#358)

The suckless coding style [^0] and the linux coding style [^1] both
recommends not indenting switch cases. And it helps out people with
lower resolution monitors.

[^0]: https://suckless.org/coding_style/
[^1]: https://www.kernel.org/doc/html/v5.10/process/coding-style.html#indentation

Co-authored-by: explosion-mental <explosion0mental@gmail.com>
Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/358
Reviewed-by: NRK <nrk@disroot.org>
Co-authored-by: explosion-mental <explosion-mental@noreply.codeberg.org>
Co-committed-by: explosion-mental <explosion-mental@noreply.codeberg.org>

main.c

@@ -765,8 +765,7 @@ static void run(void)
 			}
 		} while (discard);
 
-		switch (ev.type) {
-			/* handle events */
+		switch (ev.type) { /* handle events */
 		case ButtonPress:
 			on_buttonpress(&ev.xbutton);
 			break;