Replace dashes with underscores in canonicalized app name + remove check for valid module name

Author: egarciamendez

src/briefcase/commands/convert.py

@@ -113,12 +113,8 @@ def input_app_name(self, override_value: str | None) -> str:
         )
 
         default = "hello-world"
-        if (
-            "name" in self.pep621_data
-            and is_valid_app_name(self.pep621_data["name"])
-            and override_value is None
-        ):
-            app_name = canonicalize_name(self.pep621_data["name"])
+        if "name" in self.pep621_data and override_value is None:
+            app_name = canonicalize_name(self.pep621_data["name"]).replace("-", "_")
             self.console.divider(title="App name")
             self.console.prompt()
             self.console.prompt(