C++: Use a smaller double literal in test

This number got rounded differently on Linux and Windows, causing the
Windows test to fail.

Author: jbj

cpp/ql/test/query-tests/Likely Bugs/Underspecified Functions/MistypedFunctionArguments.expected

@@ -17,4 +17,4 @@
 | test.c:57:3:57:24 | call to defined_with_long_long | Calling $@: argument $@ of type $@ is incompatible with parameter $@. | test.c:103:11:103:32 | defined_with_long_long | defined_with_long_long | test.c:57:26:57:28 | 99 | 99 | file://:0:0:0:0 | int | int | test.c:103:44:103:45 | ll | long long ll |
 | test.c:58:3:58:24 | call to defined_with_long_long | Calling $@: argument $@ of type $@ is incompatible with parameter $@. | test.c:103:11:103:32 | defined_with_long_long | defined_with_long_long | test.c:58:26:58:26 | 3 | 3 | file://:0:0:0:0 | int | int | test.c:103:44:103:45 | ll | long long ll |
 | test.c:60:3:60:21 | call to defined_with_double | Calling $@: argument $@ of type $@ is incompatible with parameter $@. | test.c:99:8:99:26 | defined_with_double | defined_with_double | test.c:60:23:60:25 | 2 | 2 | file://:0:0:0:0 | long long | long long | test.c:99:35:99:35 | d | double d |
-| test.c:61:3:61:24 | call to defined_with_long_long | Calling $@: argument $@ of type $@ is incompatible with parameter $@. | test.c:103:11:103:32 | defined_with_long_long | defined_with_long_long | test.c:61:26:61:31 | 2.499999999999999983e+50 | 2.499999999999999983e+50 | file://:0:0:0:0 | double | double | test.c:103:44:103:45 | ll | long long ll |
+| test.c:61:3:61:24 | call to defined_with_long_long | Calling $@: argument $@ of type $@ is incompatible with parameter $@. | test.c:103:11:103:32 | defined_with_long_long | defined_with_long_long | test.c:61:26:61:31 | 3500000000000000.0 | 3500000000000000.0 | file://:0:0:0:0 | double | double | test.c:103:44:103:45 | ll | long long ll |

cpp/ql/test/query-tests/Likely Bugs/Underspecified Functions/test.c

@@ -58,7 +58,7 @@ void test(int *argv[]) {
   defined_with_long_long(3);    // BAD
 
   defined_with_double(2LL);  // BAD
-  defined_with_long_long(2.5e50);  // BAD
+  defined_with_long_long(3.5e15);  // BAD
 
   k_and_r_func(2.5, &s);  // GOOD