fix: missing include in 65acb98

caught by the github CI.
the woodpecker CI somehow missed this.

Reviewed-on: https://codeberg.org/nsxiv/nsxiv/pulls/497

main.c

@@ -25,6 +25,7 @@
 #include <assert.h>
 #include <errno.h>
 #include <fcntl.h>
+#include <limits.h>
 #include <locale.h>
 #include <poll.h>
 #include <signal.h>