examples: evas: fix else block by adding needed parenthesis

examples: evas: fix else block by adding needed parenthesis

This was broken since over a year. Happened during the automatic eo4
migration in f21ade6123b9053fca8d1632644c48525a99d6e0.

Thanks goes to the gcc warning misleading-indentation:

evas-3d-shadows.c:163:4: warning: this ‘else’ clause does not guard... [-Wmisleading-indentation]
    else
    ^~~~
evas-3d-shadows.c:165:6: note: ...this statement, but the latter is misleadingly indented as if it is guarded by the ‘else’
      evas_canvas3d_node_look_at_set(scene->mediator, EVAS_CANVAS3D_SPACE_PARENT, 0.0, 3.0, 0.0, EVAS_CANVAS3D_SPACE_PARENT, 0.0, 5.0, 0.0);