Collapse invisible whitespace in template-no-deprecated tests

Remove leading newlines and indentation from template literal test cases
so character positions in error messages are not offset by invisible whitespace.

Co-Authored-By: Claude Sonnet 4.6 <[email protected]>

Author: wagenet

tests/lib/rules/template-no-deprecated.js

@@ -17,22 +17,13 @@ const ruleTester = new RuleTester({
 ruleTester.run('template-no-deprecated', rule, {
   valid: [
     // Non-deprecated component reference
-    `
-      import SomeComponent from './some-component';
-      <template><SomeComponent /></template>
-    `,
-    // Plain HTML tag — never reported
-    `
-      <template><div></div></template>
-    `,
-    // this.something — not a scope reference
-    `
-      <template>{{this.foo}}</template>
-    `,
-    // Undefined reference — no def, skip
-    `
-      <template>{{undefinedThing}}</template>
-    `,
+    `import SomeComponent from './some-component';\n<template><SomeComponent /></template>`,
+    // Plain HTML tag -- never reported
+    `<template><div></div></template>`,
+    // this.something -- not a scope reference
+    `<template>{{this.foo}}</template>`,
+    // Undefined reference -- no def, skip
+    `<template>{{undefinedThing}}</template>`,
   ],
   invalid: [],
 });