streamslice() and streamparticles() not working correctly

[xarico10]

When using streamslice() to draw well-spaced streamlines (with direction arrows), lines and arrows are being plotted as a 3-D scatter chart.

load wind
streamslice(x,y,z,u,v,w,[],[],5)

fig2plotly(gcf, 'offline', false);

Expected and generated (https://chart-studio.plotly.com/~xarico10/1005/#/) plots:

Examples on using streamslice() can be found on:
https://www.mathworks.com/help/matlab/ref/streamslice.html

[gilbertogalvis]

PR #330 fix this issue