Fix Lint/ShadowingOuterLocalVar type of Ameba issues

.ameba.yml

@@ -14,12 +14,6 @@ Lint/UselessAssign:
     - src/invidious/helpers/errors.cr
     - src/invidious/routes/**/*.cr
 
-# Ignore shadowed variable `key` (it works for now, and that's
-# a sensitive part of the code)
-Lint/ShadowingOuterLocalVar:
-  Excluded:
-    - src/invidious/helpers/tokens.cr
-
 Lint/NotNil:
   Enabled: false
 

src/invidious/helpers/tokens.cr

@@ -45,6 +45,7 @@ def sign_token(key, hash)
   # TODO: figure out which "key" variable is used
   # Ameba reports a warning for "Lint/ShadowingOuterLocalVar" on this
   # variable, but it's preferable to not touch that (works fine atm).
+  # ameba:disable Lint/ShadowingOuterLocalVar
   hash.each do |key, value|
     next if key == "signature"