Fix not taking spacing into account for TextBox
Fix not taking spacing into account for TextBox

The TextBox did not take its TextFlows spacing into account anymore
when determining the position of a specific character index.

default0/osu-framework,peppy/osu-framework,naoey/osu-framework,ZLima12/osu-framework,DrabWeb/osu-framework,EVAST9919/osu-framework,EVAST9919/osu-framework,EVAST9919/osu-framework,Nabile-Rahmani/osu-framework,peppy/osu-framework,DrabWeb/osu-framework,ppy/osu-framework,ppy/osu-framework,Tom94/osu-framework,Tom94/osu-framework,DrabWeb/osu-framework,smoogipooo/osu-framework,EVAST9919/osu-framework,ppy/osu-framework,paparony03/osu-framework,paparony03/osu-framework,naoey/osu-framework,smoogipooo/osu-framework,ZLima12/osu-framework,RedNesto/osu-framework,default0/osu-framework,Nabile-Rahmani/osu-framework,peppy/osu-framework,RedNesto/osu-framework