Fix duplicated 12 in gridTemplateColumns in the default config

[JNavith]

No preexisting issue for this because there's no point.

This just fixes some typos from dc9d510:

// currently in defaultConfig.stub.js
gridTemplateColumns: {
      none: 'none',
      1: 'repeat(1, minmax(0, 1fr))',
      2: 'repeat(2, minmax(0, 1fr))',
      3: 'repeat(3, minmax(0, 1fr))',
      4: 'repeat(4, minmax(0, 1fr))',
      5: 'repeat(5, minmax(0, 1fr))',
      6: 'repeat(6, minmax(0, 1fr))',
      7: 'repeat(7, minmax(0, 1fr))',
      8: 'repeat(8, minmax(0, 1fr))',
      9: 'repeat(9, minmax(0, 1fr))',
      10: 'repeat(10, minmax(0, 1fr))',
      11: 'repeat(11, minmax(0, 1fr))',
      12: 'repeat(12, minmax(0, 1fr))',
      // !
      12: 'repeat(13, minmax(0, 1fr))',
      12: 'repeat(14, minmax(0, 1fr))',
      12: 'repeat(15, minmax(0, 1fr))',
      12: 'repeat(16, minmax(0, 1fr))',
},

to:

gridTemplateColumns: {
      none: 'none',
      1: 'repeat(1, minmax(0, 1fr))',
      2: 'repeat(2, minmax(0, 1fr))',
      3: 'repeat(3, minmax(0, 1fr))',
      4: 'repeat(4, minmax(0, 1fr))',
      5: 'repeat(5, minmax(0, 1fr))',
      6: 'repeat(6, minmax(0, 1fr))',
      7: 'repeat(7, minmax(0, 1fr))',
      8: 'repeat(8, minmax(0, 1fr))',
      9: 'repeat(9, minmax(0, 1fr))',
      10: 'repeat(10, minmax(0, 1fr))',
      11: 'repeat(11, minmax(0, 1fr))',
      12: 'repeat(12, minmax(0, 1fr))',
      // !
      13: 'repeat(13, minmax(0, 1fr))',
      14: 'repeat(14, minmax(0, 1fr))',
      15: 'repeat(15, minmax(0, 1fr))',
      16: 'repeat(16, minmax(0, 1fr))',
},

[simonswiss]

Good catch! Thanks for that 👍

[adamwathan]

Derp, thanks!