ConPTY: allow for unbroken copying of long lines

On Windows, ConPTY does not support 'WRAPLINE', meaning that the lines in a copied
selection were incorrectly 'hard wrapped' with a newline character, even
if the line should not have been broken.

This change makes it such that lines are hard-wrapped if:

    * the length of the selection is >= the number of columns in the
      terminal; and

    * the final column is a space (not final letter, final column)

That is, if you make a selection that is wide as the terimal *and* the
last line *is not* a space, your selection is not broken with newlines.

alacritty_terminal/src/term/mod.rs

@@ -430,7 +430,8 @@ impl<T> Term<T> {
 
         if cols.end >= self.columns() - 1
             && (line_length.0 == 0
-                || !self.grid[line][line_length - 1].flags.contains(Flags::WRAPLINE))
+                /* || !self.grid[line][line_length - 1].flags.contains(Flags::WRAPLINE)) */
+                || self.grid[line][cols.end].c == ' ')
         {
             text.push('\n');
         }