Fix haml-lint Rubocop `Style/SlicingWithRange` cop (#25947)

.haml-lint_todo.yml

 # This configuration was generated by
 # `haml-lint --auto-gen-config`
-# on 2023-07-17 09:59:21 -0400 using Haml-Lint version 0.48.0.
+# on 2023-07-17 12:00:21 -0400 using Haml-Lint version 0.48.0.
 # The point is for the user to remove these configuration records
 # one by one as the lints are removed from the code base.
 # Note that changes in the inspected code, or installation of new
 # versions of Haml-Lint, may require this file to be generated again.
 
 linters:
-  # Offense count: 69
-  RuboCop:
-    enabled: false
-
   # Offense count: 959
   LineLength:
     enabled: false
@@ -19,6 +15,10 @@ linters:
   UnnecessaryStringOutput:
     enabled: false
 
+  # Offense count: 67
+  RuboCop:
+    enabled: false
+
   # Offense count: 3
   ViewLength:
     exclude:

app/views/accounts/_og.html.haml

@@ -10,4 +10,4 @@
 = opengraph 'og:image:width', '400'
 = opengraph 'og:image:height', '400'
 = opengraph 'twitter:card', 'summary'
-= opengraph 'profile:username', acct(account)[1..-1]
+= opengraph 'profile:username', acct(account)[1..]

app/views/statuses/show.html.haml

@@ -13,7 +13,7 @@
   = opengraph 'og:title', "#{display_name(@account)} (#{acct(@account)})"
   = opengraph 'og:url', short_account_status_url(@account, @status)
   = opengraph 'og:published_time', @status.created_at.iso8601
-  = opengraph 'profile:username', acct(@account)[1..-1]
+  = opengraph 'profile:username', acct(@account)[1..]
 
   = render 'og_description', activity: @status
   = render 'og_image', activity: @status, account: @account