Refactor: Fix issues found by cppcheck

Resolve several issues found by cppcheck:

    [msl_verify.hpp:28]: (style) Class 'MinimumShipLevel' has a constructor with 1 argument that is not explicit.
    [ubi/watch.hpp:21]: (warning) Assignment of function parameter has no effect outside the function. Did you forget dereferencing it?
    [item_updater_main.cpp:22] -> [item_updater_main.cpp:49]: (style) Local variable rc shadows outer symbol
    [serialize.cpp:19]: (performance) Function parameter 'versionId' should be passed by const reference.
    [ubi/watch.hpp:43]: (style) Struct 'CustomFd' has a constructor with 1 argument that is not explicit.
    [serialize.cpp:52]: (performance) Function parameter 'versionId' should be passed by const reference.
    [serialize.cpp:116]: (performance) Function parameter 'versionId' should be passed by const reference.
    [activation.cpp:115] -> [activation.cpp:152]: (style) Local variable mapperResponseMsg shadows outer symbol
    [version.hpp:114]: (performance) Variable 'eraseCallback' is assigned in constructor body. Consider performing initialization in initialization list.
    [image_verify.hpp:53]: (style) Struct 'CustomFd' has a constructor with 1 argument that is not explicit.
    [ubi/item_updater_ubi.cpp:192]: (performance) Function parameter 'versionId' should be passed by const reference.
    [ubi/item_updater_ubi.cpp:203]: (performance) Function parameter 'versionId' should be passed by const reference.

Tested: Verify the code compiles and cppcheck does not report the above
        issues.

Change-Id: I096392a2a7a283fe198c9c29185125e61295e10f
Signed-off-by: Lei YU <mine260309@gmail.com>
diff --git a/version.hpp b/version.hpp
index 831b201..13f772f 100644
--- a/version.hpp
+++ b/version.hpp
@@ -99,8 +99,8 @@
             const std::string& versionString, VersionPurpose versionPurpose,
             const std::string& filePath, eraseFunc callback) :
         VersionInherit(bus, (objPath).c_str(), true),
-        bus(bus), objPath(objPath), parent(parent), versionId(versionId),
-        versionStr(versionString),
+        eraseCallback(callback), bus(bus), objPath(objPath), parent(parent),
+        versionId(versionId), versionStr(versionString),
         chassisStateSignals(
             bus,
             sdbusRule::type::signal() + sdbusRule::member("PropertiesChanged") +
@@ -110,8 +110,6 @@
             std::bind(std::mem_fn(&Version::updateDeleteInterface), this,
                       std::placeholders::_1))
     {
-        // Bind erase method
-        eraseCallback = callback;
         // Set properties.
         purpose(versionPurpose);
         version(versionString);