pipewire: don't setlocale from pw_init, let parent app set it

Library code generally shouldn't modify global state, so pw_init()
should not result to changing the C locale.

Instead, set the C locale in main() for tools and daemons.

We'll still setlocale for LC_MESSAGES, to get translated UI elements in
wireplumber. This workaround should be removed eventually...

src/tools/pw-metadata.c

@@ -26,6 +26,7 @@
 #include <signal.h>
 #include <math.h>
 #include <getopt.h>
+#include <locale.h>
 
 #include <spa/utils/result.h>
 #include <spa/utils/string.h>
@@ -198,6 +199,7 @@ int main(int argc, char *argv[])
 
 	setlinebuf(stdout);
 
+	setlocale(LC_ALL, "");
 	pw_init(&argc, &argv);
 
 	data.opt_name = "default";