Clean up styles on password reset button (#16721)

src/metabase/email/password_reset.mustache

@@ -7,7 +7,7 @@
     {{^sso}}
     <div style="text-align: center">
       <p>Click the button below to reset the password for your {{applicationName}} account at {{hostname}}.</p>
-      <a style="display: inline-block; box-sizing: border-box; text-decoration: none; font-size: 1.063rem; padding: 0.5rem 1.375rem; background: #FBFCFD; border: 1px solid #ddd; color: #444; cursor: pointer; text-decoration: none; border-radius: 4px; background-color: #4990E2; border-color: #4990E2; color: #fff;" href="{{passwordResetUrl}}">Reset password</a>
+      <a style="display: inline-block; box-sizing: border-box; font-size: 18px; padding: 8px 22px; cursor: pointer; text-decoration: none; border-radius: 4px; background-color: #4990E2; border-color: #4990E2; color: #fff;" href="{{passwordResetUrl}}">Reset password</a>
       <p style="padding-top: 2em; font-size: small;">Didn't request this password reset? It's safe to ignore it.</p>
     </div>
     {{/sso}}