Do not overwrite KeeShare settings created by other KeePass programs

[nirvinm]

Describe the bug
KeePassXC and KeePass supports KeeShare to support synchronizing entries between two different databases. This is achieved through the KeeShare settings (which include the KeeShare file path and a password) associated with a group. Currently, whenever a KeePass database is edited by KeePassDX, the KeeShare settings are overwritten and gets lost when reopened in other KeePass programs.

To Reproduce

1. Create a KeePassXC database in desktop
2. Create a group under Root and enable KeeShare by configuring a file path and a password.
3. Open the KeePass database in KeePassDX
4. Create a new entry anywhere using KeePassDX
5. Reopen the database in KeePassXC.

Expected behavior
KeeShare settings should not have been overwritten.

KeePass Database

• Created with: [e.g Linux / KeePassXC]
• Version: [e.g. 2.7.1]

KeePassDX:

• Version: [e.g. 3.4.4]
• Build: [e.g. Free]
• Language: [e.g. English]

Android:

• Version: [e.g. All]

[J-Jamet]

Linked to #915 #549