Fix ENVIRaster test dataset for GDAL v3.3.3 (#882)

This update provides a more explicit WKT string for the ENVI raster
dataset used in unit tests. This is necessary for GDAL v3.3.3 to be able
to recognize the EPSG code. Previous versions of GDAL were able to
correctly infer the EPSG code in my testing.

Author: gmgunter

tests/data/io/gdal/ENVIRaster-dem.hdr

@@ -10,6 +10,6 @@ data type = 4
 interleave = bsq
 byte order = 0
 map info = {Geographic Lat/Lon, 1, 1, -156.000138888886, 20.0001388888836, 0.000277777777777815, 0.000277777777777815,WGS-84}
-coordinate system string = {GEOGCS["GCS_WGS_1984",DATUM["D_WGS_1984",SPHEROID["WGS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.017453292519943295]]}
+coordinate system string = {GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AXIS["Latitude",NORTH],AXIS["Longitude",EAST],AUTHORITY["EPSG","4326"]]}
 band names = {
 Band 1}