Fix #140933: "Group Socket Node" theme property left unset

The theme property for group socket nodes was set to `#000000` for
default themes, which looked out of place against the other node
header colors. This patch adds colors to both the Blender Dark & Light
themes that should resemble their counterparts before 2ea3cd2188.

Colors:
Blender Dark - `#1d1d1d`
Blender Light - `#3d3d3d`

Pull Request: https://projects.blender.org/blender/blender/pulls/141011

release/datafiles/userdef/userdef_default_theme.c

@@ -727,7 +727,7 @@ const bTheme U_theme_default = {
     .select = RGBA(0xed5700ff),
     .active = RGBA(0xffffffff),
     .edge_select = RGBA(0xffffffb3),
-    .console_output = RGBA(0x000000ff),
+    .console_output = RGBA(0x1d1d1dff),
     .vertex_size = 3,
     .outline_width = 1,
     .facedot_size = 4,

scripts/presets/interface_theme/Blender_Light.xml

@@ -917,7 +917,7 @@
         converter_node="#4482a3"
         color_node="#8e8e3f"
         group_node="#566643"
-        group_socket_node="#000000"
+        group_socket_node="#3d3d3d"
         frame_node="#0f0f0fcc"
         matte_node="#7a5656"
         distor_node="#5d7a7a"

source/blender/blenkernel/BKE_blender_version.h

@@ -27,7 +27,7 @@
 
 /* Blender file format version. */
 #define BLENDER_FILE_VERSION BLENDER_VERSION
-#define BLENDER_FILE_SUBVERSION 28
+#define BLENDER_FILE_SUBVERSION 29
 
 /* Minimum Blender version that supports reading file written with the current
  * version. Older Blender versions will test this and cancel loading the file, showing a warning to

source/blender/blenloader/intern/versioning_userdef.cc

@@ -341,6 +341,10 @@ static void do_versions_theme(const UserDef *userdef, bTheme *btheme)
     FROM_DEFAULT_V4_UCHAR(space_properties.button);
   }
 
+  if (!USER_VERSION_ATLEAST(500, 29)) {
+    FROM_DEFAULT_V4_UCHAR(space_node.console_output);
+  }
+
   /**
    * Always bump subversion in BKE_blender_version.h when adding versioning
    * code here, and wrap it inside a USER_VERSION_ATLEAST check.