Added check if user can manage options to prevent privilege escalation

Missed capabilities checks, leading to authenticated, stored cross-site scripting (XSS) and potentially privilege escalation.

This vulnerability affects the following application versions:

• CookieYes – Cookie Banner for Cookie Consent 1.6.6
• CookieYes – Cookie Banner for Cookie Consent 1.6.7
• CookieYes – Cookie Banner for Cookie Consent 1.6.8
• CookieYes – Cookie Banner for Cookie Consent 1.6.9
• CookieYes – Cookie Banner for Cookie Consent 1.6.10
• CookieYes – Cookie Banner for Cookie Consent 1.7.0
• CookieYes – Cookie Banner for Cookie Consent 1.7.1
• CookieYes – Cookie Banner for Cookie Consent 1.7.2
• CookieYes – Cookie Banner for Cookie Consent 1.7.3
• CookieYes – Cookie Banner for Cookie Consent 1.7.4
• CookieYes – Cookie Banner for Cookie Consent 1.7.5
• CookieYes – Cookie Banner for Cookie Consent 1.7.6
• CookieYes – Cookie Banner for Cookie Consent 1.7.7
• CookieYes – Cookie Banner for Cookie Consent 1.7.8
• CookieYes – Cookie Banner for Cookie Consent 1.7.9
• CookieYes – Cookie Banner for Cookie Consent 1.8.0
• CookieYes – Cookie Banner for Cookie Consent 1.8.1
• CookieYes – Cookie Banner for Cookie Consent 1.8.2