Improving precision of ecma_number_to_string in case number can be represented as UInt32.

tests/unit/test_number_to_string.c

@@ -31,7 +31,8 @@ main( int __unused argc,
   {
     (const ecma_char_t*) "1",
     (const ecma_char_t*) "0.5",
-    (const ecma_char_t*) "12344.99931",
+    (const ecma_char_t*) "12345",
+    (const ecma_char_t*) "12345.12209",
     (const ecma_char_t*) "1.401298403e-45",
     (const ecma_char_t*) "-2.5e+38",
     (const ecma_char_t*) "NaN",
@@ -46,6 +47,7 @@ main( int __unused argc,
     1.0f,
     0.5f,
     12345.0f,
+    12345.123f,
     1.0e-45f,
     -2.5e+38f,
     NAN,