module_deps: Fix minor bugs with GN command

Bug: b/522852278
Change-Id: Ia7602dc6d23670b340d2298cfa66e13015639c8f
Reviewed-on: https://pigweed-review.googlesource.com/c/infra/recipes/+/426552

recipes/module_deps.py

diff --git a/recipes/module_deps.py b/recipes/module_deps.py
index 3cf2b53..a8be216 100644
--- a/recipes/module_deps.py
+++ b/recipes/module_deps.py
@@ -105,7 +105,7 @@
 
         query_result = api.step(
             'gn desc',
-            ['gn', 'desc', 'out', '//...', 'deps', '--all', '--as=label'],
+            ['gn', 'desc', 'out', ':default', 'deps', '--all', '--as=label'],
             stdout=api.raw_io.output_text(add_output_log=True),
         )
 
@@ -113,10 +113,8 @@
         deps = set()
         for line in stdout.splitlines():
             line = line.strip()
-            if '//pw_' in line or '/pw_' in line:
-                match = re.search(r'/(pw_[^/:]+)', line)
-                if match:
-                    deps.add(match.group(1))
+            for match in re.finditer(r'/(pw_[^/:]+)', line):
+                deps.add(match.group(1))
 
         sorted_deps = sorted(deps)
         if sorted_deps: