Fix the indentation to fix a warning:
```
/cgal/Polyhedron/demo/Polyhedron/texture.cpp:1071:3: warning: this ‘for’ clause does not guard... [-Wmisleading-indentation]
for(j=0;j<height;j++)
^~~
/cgal/Polyhedron/demo/Polyhedron/texture.cpp:1080:5: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘for’
for(j=0;j<height;j++)
^~~
```