client: better support utf-8 for table rows

The utf-8 bytes were being counted as normal ascii so the
width maximum was not being increased to include
non-printable bytes like it is for color escape sequences.
This lead to the row not printing enough characters which
effected the text further down the line.

Fix this by increasing 'max' when non-codepoint utf-8
characters are found.

client/display.c

@@ -410,7 +410,9 @@ static char* next_line(char *s, unsigned int *max, char **color_out)
 			/* color escape won't count for column width */
 			*max += color_end(s + i);
 			last_color = i;
-		}
+		/* Add width for non-codepoint UTF-8 bytes */
+		} else if (((uint8_t)s[i] >> 6) == 2)
+			*max += 1;
 	}
 
 	/* Reached the end of the string within the column bounds */