BUG: task listing aborted on embedded \c escape sequence

Fixed by removing the -e option that causes the echo command to interpret escape characters. Coloring of done tasks (the only step in the _list pipeline that required this interpretation) has been moved into the AWK pipeline step which is responsible for the priority coloring, and which does the escape character interpretation internally.
As a nice side effect, this shortening of the _list pipeline should also speed up the listing a wee bit.

tests/t1340-listescapes.sh

@@ -0,0 +1,33 @@
+#!/bin/sh
+#
+
+test_description='list with escape sequences
+
+This test checks listing of tasks that have embedded escape sequences in them.
+'
+. ./test-lib.sh
+
+#
+# check aborted list output on \c escape sequence
+#
+cat > todo.txt <<'EOF'
+first todo
+second todo run C:\WINDOWS\sysnative\cscript.exe
+third todo
+EOF
+
+test_todo_session 'aborted list output on backslash-c' <<'EOF'
+>>> todo.sh ls
+1 first todo
+2 second todo run C:\\\\WINDOWS\\\\sysnative\\\\cscript.exe
+3 third todo
+--
+TODO: 3 of 3 tasks shown
+
+>>> todo.sh ls 2
+2 second todo run C:\\\\WINDOWS\\\\sysnative\\\\cscript.exe
+--
+TODO: 1 of 3 tasks shown
+EOF
+
+test_done