Nodes: Change wire color to increase contrast

If the theme used by the user did not touch the wire or the wire outline
colors this will update them as well.

This was supposed to be a part of a bigger UI theme change for 3.0. But
it was expedited because of the recent change in line thickness for the
noodles (2bd0205215).

Theme change by Pablo Vazquez.

Differential Revision: https://developer.blender.org/D12649

release/datafiles/userdef/userdef_default_theme.c

@@ -817,7 +817,7 @@ const bTheme U_theme_default = {
     },
     .shade2 = RGBA(0x7f707064),
     .grid = RGBA(0x23232300),
-    .wire = RGBA(0x808080ff),
+    .wire = RGBA(0x232323ff),
     .select = RGBA(0xed5700ff),
     .active = RGBA(0xffffffff),
     .edge_select = RGBA(0xffffffff),