Python: Decrease import depth in regex tests

These were increased because of the indirection needed to get to the
regex flags, but as we no longer rely on this, we can make do with a
smaller import depth.

Author: tausbn

python/ql/test/library-tests/regex/Qualified.ql

@@ -2,6 +2,5 @@ import python
 import semmle.python.regex
 
 from Regex r, int start, int end, boolean maybe_empty
-where
-  r.qualifiedItem(start, end, maybe_empty) and r.getLocation().getFile().getShortName() = "test.py"
+where r.qualifiedItem(start, end, maybe_empty)
 select r.getText(), start, end, maybe_empty

python/ql/test/library-tests/regex/options

@@ -1 +1 @@
-semmle-extractor-options: --max-import-depth=3
+semmle-extractor-options: --max-import-depth=1