VRBrowser: Delete jstring local refs in string getters

GetStorageAbsolutePath and GetActiveEnvironment released the UTF chars
but never deleted the jstring local reference, unlike OnAppLink and
AppendAppNotesToCrashLog in the same file. The render thread stays
attached, so leaked locals are never reclaimed.

Fixes #2041

Author: NAME-ASHWANIYADAV

app/src/main/cpp/VRBrowser.cpp

@@ -362,6 +362,7 @@ VRBrowser::GetStorageAbsolutePath(const std::string& aRelativePath) {
   const char *cstr = sEnv->GetStringUTFChars(jStr, nullptr);
   std::string str = std::string(cstr);
   sEnv->ReleaseStringUTFChars(jStr, cstr);
+  sEnv->DeleteLocalRef(jStr);
 
   if (aRelativePath.empty()) {
     return str;
@@ -405,6 +406,7 @@ VRBrowser::GetActiveEnvironment() {
   const char *cstr = sEnv->GetStringUTFChars(jStr, nullptr);
   std::string str = std::string(cstr);
   sEnv->ReleaseStringUTFChars(jStr, cstr);
+  sEnv->DeleteLocalRef(jStr);
 
   return str;
 }