Adjust formatting rules to always re-format to new styles

Apply changes to rest of codebase again

spec/compiler/formatter/formatter_spec.cr

@@ -747,15 +747,6 @@ describe Crystal::Formatter do
     assert_format "macro f\n yield\n {{ yield }}\nend"
   end
 
-  # Allows trailing commas, but doesn't enforce them
-  assert_format <<-CRYSTAL
-    def foo(
-      a,
-      b
-    )
-    end
-    CRYSTAL
-
   assert_format <<-CRYSTAL
     def foo(
       a,
@@ -1580,7 +1571,7 @@ describe Crystal::Formatter do
   assert_format "-> : Int32 { }"
   assert_format "-> do\nend"
 
-  assert_format "-> : Int32 {}"
+  assert_format "-> : Int32 { }"
   assert_format "-> : Int32 | String { 1 }"
   assert_format "-> : Array(Int32) {}", "-> : Array(Int32) { }"
   assert_format "-> : Int32? {}", "-> : Int32? { }"

src/compiler/crystal/tools/formatter.cr

@@ -4273,15 +4273,15 @@ module Crystal
         skip_space_or_newline
       end
 
-      write " " if a_def.args.present? || return_type || whitespace_after_op_minus_gt
+      write " "
 
       is_do = false
       if @token.keyword?(:do)
         write_keyword :do
         is_do = true
       else
         write_token :OP_LCURLY
-        write " " if a_def.body.is_a?(Nop) && @token.type.space?
+        write " " if a_def.body.is_a?(Nop)
       end
       skip_space
 

src/kernel.cr

@@ -585,7 +585,7 @@ end
     def self.after_fork_child_callbacks
       @@after_fork_child_callbacks ||= [
         # reinit event loop first:
-        ->{ Crystal::EventLoop.current.after_fork },
+        -> { Crystal::EventLoop.current.after_fork },
 
         # reinit signal handling:
         ->Crystal::System::Signal.after_fork,