style(slider): Avoid escaping the backtick character within a template string.

PiperOrigin-RevId: 437068966

Author: material-web-copybara

packages/mdc-slider/foundation.ts

@@ -1089,14 +1089,14 @@ export class MDCSliderFoundation extends MDCFoundation<MDCSliderAdapter> {
       attributeValue: string|null, attributeName: string) {
     if (attributeValue === null) {
       throw new Error(
-          `MDCSliderFoundation: \`${attributeName}\` must be non-null.`);
+          'MDCSliderFoundation: `' + attributeName + '` must be non-null.');
     }
 
     const value = Number(attributeValue);
     if (isNaN(value)) {
       throw new Error(
-          `MDCSliderFoundation: \`${attributeName}\` value is ` +
-          `\`${attributeValue}\`, but must be a number.`);
+          'MDCSliderFoundation: `' + attributeName + '` value is `' +
+          attributeValue + '`, but must be a number.');
     }
 
     return value;