fix save_as gui hang due to too many calls to "generate preview path"#119

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tk421storm wants to merge 2 commits intoshotgunsoftware:masterfrom

tk421storm:millspaugh.fix_gui_hang

Commits on Aug 3, 2022

remove initial call to _start_preview_update - multiple calls of this method seem to hang the gui in nuke. preview is created fine later by callback after environment is updated
tk421storm
committed
remove source string in _start_preview_update call
tk421storm
committed