[bugfix] add detailCache = null; (#3868)

## Description:

fixed issue when leaving and trying to rejoin a clan without a reload

## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

w.o.n

src/client/ClanModal.ts

@@ -198,6 +198,7 @@ export class ClanModal extends BaseModal {
             this.selectedClan = null;
             this.selectedClanTag = "";
             this.myRole = null;
+            this.detailCache = null;
             this.view = "list";
             this.loadMyClans();
           }}
@@ -290,6 +291,7 @@ export class ClanModal extends BaseModal {
           this.selectedClan = null;
           this.selectedClanTag = "";
           this.myRole = null;
+          this.detailCache = null;
           this.view = "list";
           this.loadMyClans();
         }}