UI: Remove "Enable physics for:" text in physics properties

The "Enable physics for:" text makes no semantic sense- i.e.
"Enable physics for Fluid". Additionally, the leading text is just not
necessary, this section is just as clear without it.

Differential Revision: https://developer.blender.org/D10537

release/scripts/startup/bl_ui/properties_physics_common.py

@@ -74,10 +74,6 @@ class PHYSICS_PT_add(PhysicButtonsPanel, Panel):
     def draw(self, context):
         layout = self.layout
 
-        row = layout.row(align=True)
-        row.alignment = 'LEFT'
-        row.label(text="Enable physics for:")
-
         flow = layout.grid_flow(row_major=True, columns=0, even_columns=True, even_rows=False, align=True)
 
         obj = context.object