thunderbird: fix calendar again after icu77 switch (#407537)

pkgs/applications/networking/browsers/firefox/common.nix

@@ -76,7 +76,7 @@ in
   gnum4,
   gtk3,
   icu73,
-  icu77,
+  icu77, # if you fiddle with the icu parameters, please check Thunderbird's overrides
   libGL,
   libGLU,
   libevent,

pkgs/applications/networking/mailreaders/thunderbird/packages.nix

@@ -5,12 +5,15 @@
   callPackage,
   fetchurl,
   icu73,
+  icu77,
   fetchpatch2,
   config,
 }:
 
 let
-  icu73' = icu73.overrideAttrs (attrs: {
+  patchICU =
+    icu:
+    icu.overrideAttrs (attrs: {
       # standardize vtzone output
       # Work around ICU-22132 https://unicode-org.atlassian.net/browse/ICU-22132
       # https://bugzilla.mozilla.org/show_bug.cgi?id=1790071
@@ -22,6 +25,8 @@ let
         })
       ];
     });
+  icu73' = patchICU icu73;
+  icu77' = patchICU icu77;
 
   common =
     {
@@ -52,6 +57,7 @@ let
 
       extraPassthru = {
         icu73 = icu73';
+        icu77 = icu77';
       };
 
       meta = with lib; {
@@ -78,6 +84,7 @@ let
         pgoSupport = false; # console.warn: feeds: "downloadFeed: network connection unavailable"
 
         icu73 = icu73';
+        icu77 = icu77';
       };
 
 in