Remove problem reporting for locked package not being found, needs to be fixed in #7779 later

tests/Composer/Test/Fixtures/installer/solver-problems.test

@@ -61,12 +61,10 @@ Your requirements could not be resolved to an installable set of packages.
   Problem 2
     - The requested package bogus/pkg could not be found in any version, there may be a typo in the package name.
   Problem 3
+    - The requested package stable-requiree-excluded/pkg could not be found in any version, there may be a typo in the package name.
+  Problem 4
     - Installation request for requirer/pkg 1.* -> satisfiable by requirer/pkg[1.0.0].
     - requirer/pkg 1.0.0 requires dependency/pkg 1.0.0 -> no matching package found.
-  Problem 4
-    - stable-requiree-excluded/pkg is locked to version 1.0.0 and an update of this package was not requested.
-    - Same name, can only install one of: stable-requiree-excluded/pkg[1.0.0, 1.0.1].
-    - Installation request for stable-requiree-excluded/pkg 1.0.1 -> satisfiable by stable-requiree-excluded/pkg[1.0.1].
 
 Potential causes:
  - A typo in the package name