[release/9.0-rc2] [browser] Fix custom icu fingerprinting. (#108025)

* Fix custom icu fingerprinting.

* fix

* Update src/mono/browser/runtime/loader/icu.ts

Co-authored-by: Pavel Savara <pavelsavara@microsoft.com>

---------

Co-authored-by: Ilona Tomkowicz <32700855+ilonatommy@users.noreply.github.com>
Co-authored-by: Pavel Savara <pavelsavara@microsoft.com>

src/mono/browser/runtime/loader/icu.ts

@@ -66,8 +66,9 @@ export function getIcuResourceName (config: MonoConfig): string | null {
 
         let icuFile = null;
         if (config.globalizationMode === GlobalizationMode.Custom) {
-            if (icuFiles.length === 1) {
-                icuFile = icuFiles[0];
+            // custom ICU file is saved in the resources with fingerprinting and does not require mapping
+            if (icuFiles.length >= 1) {
+                return icuFiles[0];
             }
         } else if (config.globalizationMode === GlobalizationMode.Hybrid) {
             icuFile = "icudt_hybrid.dat";