fix: correct assignment of RasterIOHelper target_height

This typo didn't usually cause problems, except when a query was partially outside of the data range, in which case it could result in malformed data or an error (when it made the query window too large).

src/raster-tile-extractor/GeoRaster.cpp

@@ -67,10 +67,11 @@ RasterIOHelper GeoRaster::get_raster_io_helper() {
     result.min_raster_size = min_raster_size;
     result.remainder_x_left = remainder_x_left;
     result.remainder_y_top = remainder_y_top;
-    result.target_height = target_width;
+    result.target_height = target_height;
     result.target_width = target_width;
     result.usable_height = usable_height;
     result.usable_width = usable_width;
+
     return result;
 }