Fix options page width for chromium_mv3

Change-Id: I0bd41626344409efeb3b61c1baca974f3a62ca2e
diff --git a/src/options/options.ts b/src/options/options.ts
index 6cdcec9..ab51979 100644
--- a/src/options/options.ts
+++ b/src/options/options.ts
@@ -11,7 +11,7 @@
 
 const bodyStyles = document.createElement('style');
 // eslint-disable-next-line @typescript-eslint/ban-ts-comment
-// @ts-ignore #!if browser_target == 'chromium'
+// @ts-ignore #!if ['chromium', 'chromium_mv3'].includes(browser_target)
 const widthProperty = 'width: 470px;';
 // eslint-disable-next-line @typescript-eslint/ban-ts-comment
 // @ts-ignore #!else