Fixed typo introduced in test

Author: thk123

regression/goto-analyzer/sensitivity-last-written-locations-structs/test.desc

@@ -19,7 +19,7 @@ main#return_value \(\) -> TOP @ \[1\]
 do_structs::1::bool_ \(\) -> TOP @ \[16\]
 do_structs::1::bool_1 \(\) -> TOP @ \[17\]
 do_structs::1::bool_2 \(\) -> TOP @ \[18\]
-do_structs::1::st \(\) -> \{ \} @ \[19\]
+do_structs::1::st \(\) -> \{\} @ \[19\]
 do_structs::1::st \(\) -> \{.x=00000000000000000000000000001010 @ \[20\]\} @ \[20\]
 do_structs::1::st \(\) -> \{.x=00000000000000000000000000001010 @ \[20\]\, .y=00000000000000000000000000010100 @ \[21\]\} @ \[21\]
 do_structs::1::st \(\) -> \{.x=00000000000000000000000000011110 @ \[22\]\, .y=00000000000000000000000000010100 @ \[21\]\} @ \[22\]