[rhythmbox] build: fix up fm radio option check

[Jonathan Matthew <jmatthew src gnome org>]

commit 5767b0376f381262087f05b3cbd2a267d27a7a67
Author: Jonathan Matthew <jonathan d14n org>
Date:   Wed Nov 3 22:11:31 2021 +1000

    build: fix up fm radio option check
    
    The previous syntax is a hard error with meson 0.60

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 0d1251595..1d7dd3a91 100644
--- a/meson.build
+++ b/meson.build
@@ -227,7 +227,7 @@ enable_fm_radio = false
 if get_option('fm_radio').allowed()
   if cc.has_header('linux/videodev2.h')
     enable_fm_radio = true
-  elif get_option('fm_radio') == 'enabled'
+  elif get_option('fm_radio').enabled()
     error('FM radio plugin explicitly requested, but cannot be built')
   endif
 endif