fix(expansion/wildcard): do not remove quotes twice on non-pattern strings

There is still an issue with removing too many quotes when expanding variables
(see #138). This will be tackled in a later PR.

test.sh

@@ -928,4 +928,12 @@ expecting <<EOF
 hello
 EOF
 
+when_run <<"EOF" "unquoting behaviour"
+export target="'outfile'"
+echo $target
+EOF
+expecting <<EOF
+'outfile'
+EOF
+
 finalize