scripted-diff: replace ⛰ emoji with $ [skip ci]

-BEGIN VERIFY SCRIPT-
sed -i 's/⛰/$/g' $(git grep -l '⛰')
-END VERIFY SCRIPT-

brontide/README.md

@@ -24,5 +24,5 @@ between network enabled programs.
 ## Installation and Updating
 
 ```shell
-⛰  go get -u github.com/lightningnetwork/lnd/brontide
+$  go get -u github.com/lightningnetwork/lnd/brontide
 ```