error: no matching constructor for initialization of 'std::ifstream'

```
system/incremental_delivery/incfs/incfsdump/dump.cpp:238:78: error: no matching constructor for initialization of 'std::ifstream' (aka 'basic_ifstream<char>')
  238 |           : mBackingFile(android::base::Basename(std::string(backingFile))), mIn(backingFile) {}
      |                                                                              ^   ~~~~~~~~~~~
```
Flag: EXEMPT b/353528991 b/371014646
Bug: b/353528991 b/371014646

Change-Id: I7e73f433451f9361b9ffd4e4dae2a835b06b7a82
(cherry picked from commit 1c4f443533aedad8da7f90308baf3e03a9b182cd)
diff --git a/incfs/incfsdump/dump.cpp b/incfs/incfsdump/dump.cpp
index 523992f..3ce7ab0 100644
--- a/incfs/incfsdump/dump.cpp
+++ b/incfs/incfsdump/dump.cpp
@@ -235,7 +235,10 @@
 class Dump {
 public:
     Dump(std::string_view backingFile)
-          : mBackingFile(android::base::Basename(std::string(backingFile))), mIn(backingFile) {}
+          : mBackingFile(android::base::Basename(backingFile)) {
+            std::string backingFileStr(backingFile);
+              mIn.open(backingFileStr);
+    }
 
     void run() {
         if (!mIn) {