qcd: Update slash-escapes in change command for Bash 4

I was getting this error when running `qcd`'s change command on a
machine using Bash 4.4.12:

    $ sed -E "s/^shortcut       .+$/shortcut    ${p//\//\/}/" .config/qcd/database
    sed: 1: "s/^shortcut	.+$/shortcut ...": bad flag in substitute command: 'U'

The solution, as described here:
https://stackoverflow.com/questions/27787536/how-to-pass-a-variable-containing-slashes-to-sed/27788661#27788661
is to add an extra backslash to the parameter expansion. This appears to
work on both Bash 3 and 4 in my local manual tests.

1 files changed, 1 insertions, 1 deletions

diff --git a/qcd b/qcd
index 4cb18fa..091ba1a 100755
--- a/qcd
+++ b/qcd
@@ -60,7 +60,7 @@ function __qcd_change_shortcut () {
 		path=$(__qcd_absolute_path "$path")
 
 		# The `//\//\/` escapes slashes in the path so that `sed` doesn't complain
-		sed -i.bak -E "s/^${shortcut}	.+$/${shortcut}	${path//\//\/}/" $QCD_DATABASE_FILE
+		sed -i.bak -E "s/^${shortcut}	.+$/${shortcut}	${path//\//\\/}/" $QCD_DATABASE_FILE
 	fi
 }