Fix at-apply arguments

Scope all identifiers `entity.other.attribute-name.class`.
Tailwind CSS utility classes are denoted without leading period.

Author: deathaxe

PostCSS.sublime-syntax

@@ -192,7 +192,7 @@ contexts:
     - meta_scope: meta.at-rule.apply.postcss
     - match: '{{custom_ident_begin}}'
       push: custom-property-variable-content
-    - match: \.
+    - match: \.|{{ident_begin}}
       scope: punctuation.definition.entity.css
       push: selector-class-identifier-content
     - include: values

tests/syntax_test.postcss

@@ -267,7 +267,7 @@ $(tag) > .$(cls) > #$(id) : $(pseudo) [$(attr)=$(value)] { $(prop): $(value); gr
 //                         ^ punctuation.definition.entity.css
 //                                          ^^^^^^^^^ variable.other.postcss
 //                                          ^ punctuation.definition.variable.postcss
-//                                                    ^^^^^^^^ support.constant.property-value.css
+//                                                    ^^^^^^^^ entity.other.attribute-name.class.css
 //                                                            ^ punctuation.terminator.rule.css
 }