[Bug-apl] Execute each changes shape

[Kacper Gutowski]

I'm not sure when it started happening, but it seems that ⍎¨ always
returns a vector regardless of the shape of its argument:

      ⍴ ⍎¨ '1'
1
      ⍴ {⍎⍵}¨ '1'

      ⍴ ⍎¨ 2 2⍴,¨'1234'
4
      ⍴ {⍎⍵}¨ 2 2⍴,¨'1234'
2 2


-k