[Pidgin] #15330: Fix gtk_progress_set_percentage assertions during voice call

[Pidgin]

#15330: Fix gtk_progress_set_percentage assertions during voice call
-------------------------+-------------------------------------------------
 Reporter:  haakon       |      Owner:  Maiku
     Type:  patch        |     Status:  new
Milestone:  Patches      |  Component:  Voice and Video
  Needing Review         |   Keywords:  voice progressbar percentage
  Version:  2.10.6       |  assertion
-------------------------+-------------------------------------------------
 At `gtkmedia.c:level_message_cb()`, `level`, which is a float percentage
 between 0.0 and 1.0, was multiplied by 5 prior setting as a progress bar
 value. This led to many warnings in debug log like this one:

 {{{Gtk: IA__gtk_progress_set_percentage: assertion `percentage >= 0 &&
 percentage <= 1.0' failed}}}

 Patch removes the multiplication so the value is always between 0 and 1.

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Ticket URL: <https://developer.pidgin.im/ticket/15330>
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