PlaceHorizontal(): Don't render the spaces on the right

[myaaaaaaaaa]

Describe the bug
When resizing a terminal, lines that run the whole width will wrap to the next line, causing garbage to accumulate at the top:

It'd be nice if terminals could find a way to fix this, but for now, we might as well alleviate this problem by leaving room on the right whenever possible:

Fix should be fairly straightforward, something like this:

diff --git a/position.go b/position.go
index 185f5af..1a9a897 100644
--- a/position.go
+++ b/position.go
@@ -72,5 +72,4 @@ func (r *Renderer) PlaceHorizontal(width int, pos Position, str string, opts ...
 		case Left:
 			b.WriteString(l)
-			b.WriteString(ws.render(gap + short))
 
 		case Right:
@@ -87,5 +86,4 @@ func (r *Renderer) PlaceHorizontal(width int, pos Position, str string, opts ...
 			b.WriteString(ws.render(left))
 			b.WriteString(l)
-			b.WriteString(ws.render(right))
 		}
 

[myaaaaaaaaa]

Alternatively, there's also the option of handling this on the bubbletea side - basically TrimRight()ing the whitespace from the return value of Model.View() before rendering.