replacements: strip spaces from replacement URL.

Fix a handful of replacements having a replacement URL with a space in front or at the end.
This caused problems when searching by replacement URL.

app/logical/post_replacement_processor.rb

@@ -27,7 +27,7 @@ class PostReplacementProcessor
     elsif Source::URL.page_url(image_url).present?
       canonical_url = image_url
     else
-      canonical_url = replacement.replacement_url
+      canonical_url = replacement.replacement_url.strip
     end
 
     replacement.replacement_url = canonical_url

script/fixes/130_fix_replacement_urls.rb

@@ -0,0 +1,14 @@
+#!/usr/bin/env ruby
+
+require_relative "base"
+
+with_confirmation do
+  fix = ENV.fetch("FIX", "false").truthy?
+
+  PostReplacement.where_regex(:replacement_url, "(^ )|( $)").find_each do |replacement|
+    replacement.replacement_url = replacement.replacement_url.strip
+
+    replacement.save!(touch: false) if fix
+    puts ({ id: replacement.id, changes: replacement.changes }).to_json
+  end
+end