[nullsafe][EASY] correct the signature for Preconditions.checkNotNull()

Summary:
The one with Object as the second param is in `com.facebook.common.internal`.
The one with String as the second param is in `com.facebook.common.preconditions`.

(Don't ask :) )

Reviewed By: artempyanykh

Differential Revision: D19087334

fbshipit-source-id: ba02c9101

infer/src/nullsafe/modelTables.ml

@@ -94,7 +94,7 @@ let check_not_null_parameter_list, check_not_null_list =
       )
     ; ( 1
       , (o, [x; n])
-      , "com.facebook.common.preconditions.Preconditions.checkNotNull(java.lang.Object,java.lang.Object):java.lang.Object"
+      , "com.facebook.common.preconditions.Preconditions.checkNotNull(java.lang.Object,java.lang.String):java.lang.Object"
       )
     ; ( 1
       , (o, [x; n; n])