remove unused functions from config

config.lua

@@ -1,19 +1,5 @@
 local preset = 'snes'
 
-local function approx_cossim(dim)
-    return math.pow(1.521 * dim - 0.521, -0.5026)
-end
-
-local function intmap(x)
-    --  0 -> 1.0
-    -- -1 -> 0.316
-    -- -2 -> 0.1
-    -- -3 -> 0.0316
-    -- -4 -> 0.01
-    -- etc.
-    return math.pow(10, x / 2)
-end
-
 local common_cfg = {
     -- read-only modes:
     playable_mode = false,