Give up on colored PS4

The first mistake here was to forget to wrap console codes with \[…\];
for some reason though after adding those…

  export PS4=$(echo -en '\[\e[7m\]+ \[\e[0m\]')

… bash no longer repeats the first character (+) according to the
indirection level, or rather, it repeats an entirely unrelated
character:

$ ( PS4='+ ' ; set -x ; echo $(echo $(echo hi | grep hi)) )
+++ echo hi
+++ grep --color=auto hi
++ echo hi
+ echo hi
hi
$ ( PS4=$(echo -en '\[\e[7m\]+ \[\e[0m\]')
    set -x
    echo $(echo $(echo hi | grep hi))
  ) |& hexdump -C
00000000  01 01 01 1b 5b 37 6d 02  2b 20 01 1b 5b 30 6d 02  |....[7m.+ ..[0m.|
          ^^ ^^ ^^ (echo)
00000010  65 63 68 6f 20 68 69 0a  01 01 01 1b 5b 37 6d 02  |echo hi.....[7m.|
                                   ^^ ^^ ^^ (grep)
00000020  2b 20 01 1b 5b 30 6d 02  67 72 65 70 20 2d 2d 63  |+ ..[0m.grep --c|
00000030  6f 6c 6f 72 3d 61 75 74  6f 20 68 69 0a 01 01 1b  |olor=auto hi....|
                                                  ^^ ^^ (echo)
00000040  5b 37 6d 02 2b 20 01 1b  5b 30 6d 02 65 63 68 6f  |[7m.+ ..[0m.echo|
00000050  20 68 69 0a 01 1b 5b 37  6d 02 2b 20 01 1b 5b 30  | hi...[7m.+ ..[0|
                      ^^ (echo)
00000060  6d 02 65 63 68 6f 20 68  69 0a 68 69 0a           |m.echo hi.hi.|
0000006d

No idea where those ^A characters come from.

While at it, wrap PS2 to avoid line-wrapping shenanigans.

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