Escape \ in Python strings

It seems Python complains about this for some Python versions.

Author: nickygerritsen

misc-tools/import-contest.in

@@ -149,10 +149,10 @@ if import_file('organizations', ['organizations.json']):
     # Also import logos if we have any
     # We prefer the 64x64 logo. If it doesn't exist, accept a generic logo (which might be a SVG)
     # We also prefer PNG/SVG before JPG
-    import_images('organizations', 'logo', ['^logo\.64x\d+\.png$', '^logo\.(png|svg)$', '^logo\.64x\d+\.jpg$', '^logo\.jpg$'])
+    import_images('organizations', 'logo', ['^logo\\.64x\\d+\\.png$', '^logo\\.(png|svg)$', '^logo\\.64x\\d+\\.jpg$', '^logo\\.jpg$'])
 if import_file('teams', ['teams.json', 'teams2.tsv']):
     # Also import photos if we have any, but prefer JPG over SVG and PNG
-    import_images('teams', 'photo', ['^photo\.jpg$', '^photo\.(png|svg)$'])
+    import_images('teams', 'photo', ['^photo\\.jpg$', '^photo\\.(png|svg)$'])
 import_file('accounts', ['accounts.json', 'accounts.yaml', 'accounts.tsv'])
 
 problems_imported = False