patch 9.0.1580: CI: indent test hangs on FreeBSD

Problem:    CI: indent test hangs on FreeBSD.
Solution:   Set 'nomore' when running the indent tests. (Ozaki Kiichi,
            closes #12446)
diff --git a/runtime/indent/testdir/runtest.vim b/runtime/indent/testdir/runtest.vim
index fa4e16e..882a140 100644
--- a/runtime/indent/testdir/runtest.vim
+++ b/runtime/indent/testdir/runtest.vim
@@ -12,6 +12,7 @@
 set report=9999
 set modeline
 set debug=throw
+set nomore
 
 au! SwapExists * call HandleSwapExists()
 func HandleSwapExists()