client shims: Remove some duplicate code

Both commit 44e6b2d24e and 4eda67ce54 added the same function to this
file (and by the commit message, the later was intended to do so, while
the former has an unrelated commit message (but does not contain any
other changes)).

Signed-off-by: Uli Schlachter <psychon@znc.in>

tests/examples/shims/client.lua

@@ -200,14 +200,6 @@ function client.gen_fake(args)
         return ret.data._struts
     end
 
-    function ret:struts(new)
-        for k, v in pairs(new or {}) do
-            ret.data._struts[k] = v
-        end
-
-        return ret.data._struts
-    end
-
     -- Set a dummy one for now since set_screen will corrupt it.
     ret._old_geo = {}