fix(composer): Do not use the managerName for packages

The `managerName` is meant to be used only for the `Identifier.type` of
`Project`s.

Signed-off-by: Frank Viernau <frank_viernau@epam.com>

plugins/package-managers/composer/src/main/kotlin/Composer.kt

@@ -249,7 +249,7 @@ class Composer(
 
             packages[rawName] = Package(
                 id = Identifier(
-                    type = managerName,
+                    type = "Composer",
                     namespace = rawName.substringBefore('/'),
                     name = rawName.substringAfter('/'),
                     version = version