[Pidgin] #15699: Set transient for flag for tooltip windows

[Pidgin]

#15699: Set transient for flag for tooltip windows
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 Reporter:  mforney  |      Owner:  rekkanoryo
     Type:  patch    |     Status:  new
Milestone:           |  Component:  unclassified
  Version:           |   Keywords:
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 In wayland, global coordinates are unavailable, so currently tooltip
 windows are positioned randomly about the screen.

 This patch sets the transient for flag for the tooltip windows so they can
 be positioned relative to the buddy list.

 Tested under X11 and Wayland

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Ticket URL: <https://developer.pidgin.im/ticket/15699>
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