Revert "Enable Style/BlockDelimiters rule."

This reverts commit 3c22fb6b70.

.rubocop.yml

@@ -2,11 +2,11 @@ AllCops:
   TargetRubyVersion: 2.4
   DisabledByDefault: true
   Exclude:
-    - "db/schema.rb"
-    - "bundle/**/*"
-    - "vendor/**/*"
-    - "node_modules/**/*"
-    - "public/**/*"
+    - 'db/schema.rb'
+    - 'bundle/**/*'
+    - 'vendor/**/*'
+    - 'node_modules/**/*'
+    - 'public/**/*'
 
 # Prefer &&/|| over and/or.
 Style/AndOr:
@@ -17,10 +17,6 @@ Style/AndOr:
 Style/BracesAroundHashParameters:
   Enabled: true
 
-# Check for uses of braces or do/end around single line or multi-line blocks.
-Style/BlockDelimiters:
-  Enabled: true
-
 # Align `when` with `case`.
 Layout/CaseIndentation:
   Enabled: true