Userland: Use allocation-failure safe functions where it's easy

I went through all callers of adopt_own() and replaced them with
try_make<>() if possible or adopt_nonnull_own_or_enomem() else
in cases where it was easy (i.e. in functions already returning
ErrorOr).

No intended behavior change.

Userland/Libraries/LibGLSL/Linker.cpp

@@ -26,7 +26,7 @@ ErrorOr<NonnullOwnPtr<LinkedShader>> Linker::link(Vector<ObjectFile const*> cons
     };
     TRY(shader.instructions.try_append(instruction));
 
-    return adopt_own(*new LinkedShader(shader));
+    return try_make<LinkedShader>(shader);
 }
 
 }