context: set zero_denormals in data thread.

Use invoke to set the zero-denormals flag from the data thread when
explicitly set. The flag is per thread and should really only be set on
the data thread and only when explicitly enabled.

Fixes #2160

src/daemon/minimal.conf.in

@@ -20,7 +20,7 @@ context.properties = {
     #mem.mlock-all                         = false
     #clock.power-of-two-quantum            = true
     #log.level                             = 2
-    #cpu.zero.denormals                    = true
+    #cpu.zero.denormals                    = false
 
     core.daemon = true              # listening for socket connections
     core.name   = pipewire-0        # core name and socket name

src/daemon/pipewire.conf.in

@@ -20,7 +20,7 @@ context.properties = {
     #mem.mlock-all                         = false
     #clock.power-of-two-quantum            = true
     #log.level                             = 2
-    #cpu.zero.denormals                    = true
+    #cpu.zero.denormals                    = false
 
     core.daemon = true              # listening for socket connections
     core.name   = pipewire-0        # core name and socket name