cmds:output: fix quoted defs not stripped

With the following config:

    def $abc "wayland wayland "

The following command would fail to be executed:

    swaymsg -- output '$abc' scale 2

The definition `$abc` is replaced with its content, including the quotes,
which fails to match real output names.

We now strip quotes early in the output command.

Author: paul-ri

sway/commands/output.c

@@ -2,6 +2,7 @@
 #include "sway/commands.h"
 #include "sway/config.h"
 #include "sway/output.h"
+#include "stringop.h"
 #include "list.h"
 #include "log.h"
 
@@ -39,6 +40,13 @@ struct cmd_results *cmd_output(int argc, char **argv) {
 				"Refusing to configure the no op output");
 	}
 
+	// Handle cases where output name was replaced by a definition with quotes
+	for (int i = 0; i < argc; ++i) {
+		if (*argv[i] == '\"' || *argv[i] == '\'') {
+			strip_quotes(argv[i]);
+		}
+	}
+
 	struct output_config *output = NULL;
 	if (strcmp(argv[0], "-") == 0 || strcmp(argv[0], "--") == 0) {
 		if (config->reading) {