Fix lint issues

Author: sdarnell

tests/fixtures/rules/prefer-class-directive/invalid/_config.json

@@ -1,3 +1,3 @@
 {
-  "options": [{ "prefer": "always" }]
+	"options": [{ "prefer": "always" }]
 }

tests/fixtures/rules/prefer-class-directive/valid/_config.json

@@ -1,3 +1,3 @@
 {
-  "options": [{ "prefer": "always" }]
+	"options": [{ "prefer": "always" }]
 }

tests/fixtures/rules/prefer-class-directive/valid/empty/_config.json

@@ -1,3 +1,3 @@
 {
-  "options": [{ "prefer": "empty" }]
+	"options": [{ "prefer": "empty" }]
 }

tests/fixtures/rules/prefer-class-directive/valid/empty/ignore-test05-input.svelte

@@ -4,7 +4,7 @@
 	let danger = false;
 </script>
 
-<button class="{a ? 'a' : 'b'}">foo</button>
-<button class="{!a ? 'b' : 'a'}">foo</button>
-<button class="{a7 === 7 ? 'a' : 'b'}">foo</button>
+<button class={a ? 'a' : 'b'}>foo</button>
+<button class={!a ? 'b' : 'a'}>foo</button>
+<button class={a7 === 7 ? 'a' : 'b'}>foo</button>
 <button class="btn {danger ? 'btn-danger' : 'btn-primary'}">foo</button>