Removed the code related to gtk_window_set_icon_list. This code doesn't gain us much and will have even less impact in the future.
Testing Done:
Compiled, ran, verified that calling `gtk_window_set_icon_list(window, NULL);` doesn't crash. I couldn't actually check what a window manager will display because my window manager doesn't show icons.
Reviewed at https://reviews.imfreedom.org/r/77/
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# Translators:
# Abhigyan sen <abhigyan008@gmail.com>, 2015
# Rajesh Ranjan <rajesh672@gmail.com>, 2016
# Rajesh Ranjan <rajeshkajha@yahoo.com>, 2010
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