Remove non-standard : anchors

ci/pr-snap.sh

@@ -1,12 +1,11 @@
 #!/usr/bin/env bash
-set -e
 #
 # Only run snap.sh for pull requests that modify files under /snap
 #
-
+set -e
 cd "$(dirname "$0")"/..
 
-ci/affects-files.sh :snap/ || {
+ci/affects-files.sh ^snap/ || {
   echo "Skipping snap build as no files under /snap were modified"
   exit 0
 }