runtime(indent-tests): Raise timeouts for "search*()"es

Related to #15974 and #16870.

closes: #17116

Signed-off-by: Aliaksei Budavei <0x000c70@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/indent/testdir/html.in b/runtime/indent/testdir/html.in
index 4783a09..72a38b9 100644
--- a/runtime/indent/testdir/html.in
+++ b/runtime/indent/testdir/html.in
@@ -2,6 +2,7 @@
 
 
 % START_INDENT
+% INDENT_EXE let b:html_indent_line_limit = 64
 <html>
     <body>
 <style>