ui: resource tree: fix extra space inconsistency in some node elements

ui: resource tree: fix extra space inconsistency in some node elements

When a node element was updated, it was put through the 'setText'
method which accidentally added a space before it's name.

Fix this by putting the space into the status variable.

Without this patch one could observe a vertical misalignment when some
nodes had guests on them but others had none.

Fixes: 2f414c50 ("ui: resource tree: limit tooltip to icon and text")
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>