remove bad test from get_updated_dict (#46944)

PR #42328 (21ebabf) already fixed
issue #35217 by removing the bad test. Now also remove the nonsensical
comment condition from loading.jl.

base/loading.jl

@@ -232,12 +232,10 @@ end
 
 function get_updated_dict(p::TOML.Parser, f::CachedTOMLDict)
     s = stat(f.path)
-    time_since_cached = time() - f.mtime
-    rough_mtime_granularity = 0.1 # seconds
-    # In case the file is being updated faster than the mtime granularity,
-    # and have the same size after the update we might miss that it changed. Therefore
-    # always check the hash in case we recently created the cache.
-    if time_since_cached < rough_mtime_granularity || s.inode != f.inode || s.mtime != f.mtime || f.size != s.size
+    # note, this might miss very rapid in-place updates, such that mtime is
+    # identical but that is solvable by not doing in-place updates, and not
+    # rapidly changing these files
+    if s.inode != f.inode || s.mtime != f.mtime || f.size != s.size
         content = read(f.path)
         new_hash = _crc32c(content)
         if new_hash != f.hash