fix(files_sharing): do not check password checkbox by default

The checkbox appears checked when no password is set (share.password ===
undefined)

Signed-off-by: Salvatore Martire <[email protected]>

Author: salmart-dev

apps/files_sharing/src/mixins/SharesMixin.js

@@ -165,7 +165,7 @@ export default {
 		isPasswordProtected: {
 			get() {
 				return this.config.enforcePasswordForPublicLink
-						|| this.share.password !== ''
+						|| this.share.password !== undefined
 						|| this.share.newPassword !== undefined
 			},
 			async set(enabled) {