wallet: Fix already-loading error message grammar

Author: kootoopas

src/wallet/wallet.cpp

@@ -235,7 +235,7 @@ std::shared_ptr<CWallet> LoadWallet(interfaces::Chain& chain, const std::string&
 {
     auto result = WITH_LOCK(g_loading_wallet_mutex, return g_loading_wallet_set.insert(name));
     if (!result.second) {
-        error = Untranslated("Wallet already being loading.");
+        error = Untranslated("Wallet already loading.");
         status = DatabaseStatus::FAILED_LOAD;
         return nullptr;
     }

test/functional/wallet_multiwallet.py

@@ -34,7 +34,7 @@ def test_load_unload(node, name):
             node.loadwallet(name)
             node.unloadwallet(name)
         except JSONRPCException as e:
-            if e.error['code'] == -4 and 'Wallet already being loading' in e.error['message']:
+            if e.error['code'] == -4 and 'Wallet already loading' in e.error['message']:
                 got_loading_error = True
                 return