golf recollide_reanchor

Uses fmt in recollide_reanchor. This has a performance impact in code that is already slow so this might need to be reverted; I think that should be part of a comprehensive optimization pass, however, and making it worse for now as part of a general code cleanup is probably better.

chameleonic.p8

@@ -470,8 +470,7 @@ function level:recollide_reanchor()
      not self:mcoll(mx1,my0) and
      not self:mcoll(mx1,my1)
     ) then
-     local key="GEOM"..mx0..","..my0..","..dx..","..dy
-     anch_new[key]= {
+     anch_new[fmt("GEOM%v,%v,%v,%v",mx0,my0,dx,dy)]= {
       max(mx0,mx1),max(my0,my1),adx=-dx,ady=-dy
      }
     end
@@ -479,10 +478,9 @@ function level:recollide_reanchor()
   end
 
   for _,cr in pairs(self._crates) do
-   local key="CRATE"..cr.id..","..dx..","..dy
    local mx0,my0=cr.mx,cr.my
    local mx1,my1=mx0+dx,my0+dy
-   anch_new[key]={
+   anch_new[fmt("CRATE%v,%v,%v",cr.id,dx,dy)]={
     max(mx0,mx1),max(my0,my1),adx=-dx,ady=-dy
    }
   end