builtin: Adopt our C code style for the builtin VCL

I removed the else keyword from vcl_backend_response because it doesn't
add any value.

Better diff with the --ignore-all-space option.

bin/varnishd/builtin.vcl

@@ -73,10 +73,10 @@ sub vcl_recv {
 }
 
 sub vcl_pipe {
-    # By default Connection: close is set on all piped requests, to stop
+	# By default "Connection: close" is set on all piped requests, to stop
 	# connection reuse from sending future requests directly to the
-    # (potentially) wrong backend. If you do want this to happen, you can undo
-    # it here.
+	# (potentially) wrong backend. If you do want this to happen, you can
+	# undo it here:
 	# unset bereq.http.connection;
 	return (pipe);
 }
@@ -148,7 +148,8 @@ sub vcl_backend_fetch {
 sub vcl_backend_response {
 	if (bereq.uncacheable) {
 		return (deliver);
-    } else if (beresp.ttl <= 0s ||
+	}
+	if (beresp.ttl <= 0s ||
 	    beresp.http.Set-Cookie ||
 	    beresp.http.Surrogate-control ~ "(?i)no-store" ||
 	    (!beresp.http.Surrogate-Control &&