remove done shader TODO

shaders/cell.v.glsl

@@ -130,8 +130,6 @@ void main() {
         vec2 glyph_offset_calc = glyph_offset;
 
         // If the glyph is larger than our cell, we need to downsample it
-        // TODO: for now, we assume this means it is a full width character
-        // TODO: in the future, use unicode libs to verify this.
         vec2 glyph_size_downsampled = glyph_size;
         if (glyph_size.x > cell_size.x) {
             glyph_size_downsampled.x = cell_size_scaled.x;