r.in.gdal: fix and enable test

[petrasovaa]

This should fix r.in.gdal test. I changed the expected east/west to match the actual imported data, which also matches what gdalinfo reports on the testdata. Why this wasn't the case before, I don't know.

Relevant output from gdalinfo on the test dataset:

Files: data/elevation3d.nc
Size is 150, 135
Origin = (630000.000000000000000,228500.000000000000000)
Pixel Size = (100.000000000000000,-100.000000000000000)
Corner Coordinates:
Upper Left  (  630000.000,  228500.000) 
Lower Left  (  630000.000,  215000.000) 
Upper Right (  645000.000,  228500.000) 
Lower Right (  645000.000,  215000.000) 
Center      (  637500.000,  221750.000)