conf: fix videotestsrc example configuration

In JSON, the colon actually is used for assignment, but in spa_type_info
the colon is used as a separator. To properly parse and pass the
properties to the videotestsrc, the key has to be enclosed by quotation
marks to prevent splitting by the JSON parser.

src/daemon/minimal.conf.in

@@ -144,7 +144,7 @@ context.objects = [
     # Creates an object from a PipeWire factory with the given parameters.
     # If nofail is given, errors are ignored (and no object is created).
     #
-    #{ factory = spa-node-factory   args = { factory.name = videotestsrc node.name = videotestsrc node.description = videotestsrc Spa:Pod:Object:Param:Props:patternType = 1 } }
+    #{ factory = spa-node-factory   args = { factory.name = videotestsrc node.name = videotestsrc node.description = videotestsrc "Spa:Pod:Object:Param:Props:patternType" = 1 } }
     #{ factory = spa-device-factory args = { factory.name = api.jack.device foo=bar } flags = [ nofail ] }
     #{ factory = spa-device-factory args = { factory.name = api.alsa.enum.udev } }
     #{ factory = spa-node-factory   args = { factory.name = api.alsa.seq.bridge node.name = Internal-MIDI-Bridge } }

src/daemon/pipewire-vulkan.conf.in

@@ -88,7 +88,7 @@ context.objects = [
     # If condition is given, the object is created only when the context properties
     # all match the match rules.
     #
-    #{ factory = spa-node-factory   args = { factory.name = videotestsrc node.name = videotestsrc node.description = videotestsrc Spa:Pod:Object:Param:Props:patternType = 1 } }
+    #{ factory = spa-node-factory   args = { factory.name = videotestsrc node.name = videotestsrc node.description = videotestsrc "Spa:Pod:Object:Param:Props:patternType" = 1 } }
     #{ factory = spa-device-factory args = { factory.name = api.jack.device foo=bar } flags = [ nofail ] }
     #{ factory = spa-device-factory args = { factory.name = api.alsa.enum.udev } }
     #{ factory = spa-node-factory   args = { factory.name = api.alsa.seq.bridge node.name = Internal-MIDI-Bridge } }

src/daemon/pipewire.conf.in

@@ -214,7 +214,7 @@ context.objects = [
     # If condition is given, the object is created only when the context properties
     # all match the match rules.
     #
-    #{ factory = spa-node-factory   args = { factory.name = videotestsrc node.name = videotestsrc node.description = videotestsrc Spa:Pod:Object:Param:Props:patternType = 1 } }
+    #{ factory = spa-node-factory   args = { factory.name = videotestsrc node.name = videotestsrc node.description = videotestsrc "Spa:Pod:Object:Param:Props:patternType" = 1 } }
     #{ factory = spa-device-factory args = { factory.name = api.jack.device foo=bar } flags = [ nofail ] }
     #{ factory = spa-device-factory args = { factory.name = api.alsa.enum.udev } }
     #{ factory = spa-node-factory   args = { factory.name = api.alsa.seq.bridge node.name = Internal-MIDI-Bridge } }