Remove the config file for the no-OTR build.

Custom builds like this should rather be done by removing components in
converse.js and then running `make build`

src/build-no-otr.js

-({
-    baseUrl: "../",
-    name: "components/almond/almond.js",
-    out: "../builds/converse-no-otr.min.js",
-    include: ['main'],
-    mainConfigFile: '../main.js',
-    paths: {
-        "converse-dependencies":    "src/deps-no-otr"
-    }
-})