Fix deps parsing from striping whitespace on non-deps output

src/dds/build/deps.cpp

     auto lines = split_view(output, "\n");
     std::string cleaned_output;
     deps_info   deps;
-    for (auto line : lines) {
-        line = trim_view(line);
-        if (!starts_with(line, leader)) {
-            cleaned_output += std::string(line);
+    for (const auto full_line : lines) {
+        auto trimmed = trim_view(full_line);
+        if (!starts_with(trimmed, leader)) {
+            cleaned_output += std::string(full_line);
             cleaned_output.push_back('\n');
             continue;
         }
-        auto remaining = trim_view(line.substr(leader.size()));
+        auto remaining = trim_view(trimmed.substr(leader.size()));
         deps.inputs.emplace_back(fs::weakly_canonical(remaining));
     }
     if (!cleaned_output.empty()) {

src/dds/build/deps.test.cpp

 Note: including file:    C:\foo\bar\filepath/thing.hpp
 Note: including file:  C:\foo\bar\filepath/baz.h
 Note: including file:      C:\foo\bar\filepath/quux.h
-Note: including file:   C:\foo\bar\filepath/cats/quux.h
+    Note: including file:   C:\foo\bar\filepath/cats/quux.h
 Other line
+    indented line
 Something else
 )";
 
     auto  res        = dds::parse_msvc_output_for_deps(mscv_output, "Note: including file:");
     auto& deps       = res.deps_info;
     auto  new_output = res.cleaned_output;
-    CHECK(new_output == "\nOther line\nSomething else\n");
+    CHECK(new_output == "\nOther line\n    indented line\nSomething else\n");
     CHECK(deps.inputs
           == std::vector<dds::fs::path>({
                  "C:\\foo\\bar\\filepath/thing.hpp",