Small bugfix in 1d CartesianGrid

[fverdugo]

No description provided.

[codecov-io]

Codecov Report

Merging #192 into master will increase coverage by 6.26%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #192      +/-   ##
==========================================
+ Coverage   82.64%   88.91%   +6.26%     
==========================================
  Files         133      133              
  Lines        6622     8193    +1571     
==========================================
+ Hits         5473     7285    +1812     
+ Misses       1149      908     -241

Impacted Files	Coverage Δ
src/Geometry/CartesianGrids.jl	88% <66.66%> (+18.35%)	⬆️
src/FESpaces/FESpaceFactories.jl	85.71% <0%> (-10.07%)	⬇️
src/Geometry/GridTopologyMocks.jl	90.47% <0%> (-9.53%)	⬇️
src/Geometry/UnstructuredGrids.jl	68.42% <0%> (-4.92%)	⬇️
src/Algebra/NLSolvers.jl	98.66% <0%> (-1.34%)	⬇️
src/Gridap.jl	100% <0%> (ø)	⬆️
src/Exports.jl	100% <0%> (ø)	⬆️
src/MultiField/MultiField.jl	100% <0%> (ø)	⬆️
src/FESpaces/FESpaces.jl	100% <0%> (ø)	⬆️
src/Polynomials/QGradMonomialBases.jl	100% <0%> (ø)	⬆️
... and 112 more

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