[CLEANUP] Avoid magic method forwarding in KeyFrame (#1158)

Part of #1147

Author: oliverklee

config/phpstan-baseline.neon

@@ -42,18 +42,6 @@ parameters:
 			count: 1
 			path: ../src/CSSList/Document.php
 
-		-
-			message: '#^Call to an undefined method Sabberworm\\CSS\\OutputFormat\:\:comments\(\)\.$#'
-			identifier: method.notFound
-			count: 1
-			path: ../src/CSSList/KeyFrame.php
-
-		-
-			message: '#^Call to an undefined method Sabberworm\\CSS\\OutputFormat\:\:spaceBeforeOpeningBrace\(\)\.$#'
-			identifier: method.notFound
-			count: 1
-			path: ../src/CSSList/KeyFrame.php
-
 		-
 			message: '#^Loose comparison via "\=\=" is not allowed\.$#'
 			identifier: equal.notAllowed

src/CSSList/KeyFrame.php

@@ -61,8 +61,9 @@ public function __toString(): string
 
     public function render(OutputFormat $outputFormat): string
     {
-        $result = $outputFormat->comments($this);
-        $result .= "@{$this->vendorKeyFrame} {$this->animationName}{$outputFormat->spaceBeforeOpeningBrace()}{";
+        $formatter = $outputFormat->getFormatter();
+        $result = $formatter->comments($this);
+        $result .= "@{$this->vendorKeyFrame} {$this->animationName}{$formatter->spaceBeforeOpeningBrace()}{";
         $result .= $this->renderListContents($outputFormat);
         $result .= '}';
         return $result;