UI: Start UIList with 2 rows for materials/particles

There is room for it anyway because of the 3 buttons on the right.

release/scripts/startup/bl_ui/properties_material.py

@@ -98,7 +98,7 @@ class EEVEE_MATERIAL_PT_context_material(MaterialButtonsPanel, Panel):
 
         if ob:
             is_sortable = len(ob.material_slots) > 1
-            rows = 1
+            rows = 2
             if (is_sortable):
                 rows = 4
 

release/scripts/startup/bl_ui/properties_particle.py

@@ -150,7 +150,7 @@ class PARTICLE_PT_context_particles(ParticleButtonsPanel, Panel):
             row = layout.row()
 
             row.template_list("PARTICLE_UL_particle_systems", "particle_systems", ob, "particle_systems",
-                              ob.particle_systems, "active_index", rows=1)
+                              ob.particle_systems, "active_index", rows=2)
 
             col = row.column(align=True)
             col.operator("object.particle_system_add", icon='ZOOMIN', text="")