Fix the "Save Image" label ID

It was incorrectly `save`, while it should have been `saveImage`.

Fixes #81

Author: sindresorhus

index.d.ts

@@ -35,7 +35,7 @@ declare namespace contextMenu {
 		/**
 		@default 'Save Image'
 		*/
-		readonly save?: string;
+		readonly saveImage?: string;
 
 		/**
 		@default 'Save Image As…'

index.js

@@ -84,7 +84,7 @@ const create = (win, options) => {
 				}
 			}),
 			saveImage: decorateMenuItem({
-				id: 'save',
+				id: 'saveImage',
 				label: 'Save Image',
 				visible: props.mediaType === 'image',
 				click(menuItem) {