fix: don't parse the 'username' and 'password' key

tessen wasn't excluding 'username' and 'password' as a key from the menu
which isn't expected behaviour because the value of username is
determined from the basename of the selected file and password is
selected from the first line of the file

tessen

@@ -61,7 +61,7 @@ get_pass_data() {
   # skip the password, validate each entry against $passdata_regex, store valid results
   # ASSUMPTION: each key is unique otherwise, the value of the last non-unique key will be used
   for idx in "${passdata[@]:1}"; do
-    if [[ "$idx" =~ $passdata_regex ]]; then
+    if [[ "${idx%%:*}" != "username" && "${idx%%:*}" != "password" && "$idx" =~ $passdata_regex ]]; then
       key="${idx%%:*}"
       val="${idx#*: }"
       PASSDATA_ARR["$key"]="$val"