Rename .map.txt used by tests

The suffix ".map.txt" triggers NDK-API-Review.
example.map.txt has been replaced with map.txt in the same directory.

Test: ANDROID_BUILD_TOP=`realpath .` \
      PATH=$PATH:`realpath out/soong/dist/bin` \
      development/vndk/tools/header-checker/tests/test.py
Bug: 298626434
Change-Id: Ie2e21fe87e5bfce7f081fe32eb55547d8aa611ad

vndk/tools/header-checker/tests/integration/version_script_example/example.map.txt

@@ -1,17 +0,0 @@
-LIBVERSION_SCRIPT_EXAMPLE_1.0 {
-  global:
-    test1;  # mytag
-    extern "C++" {
-      Test3::*;  # mytag
-    };
-  local:
-    *;
-};
-
-LIBVERSION_SCRIPT_EXAMPLE_PRIVATE {
-  global:
-    test2;
-    extern "C++" {
-      Test4::*;
-    };
-} LIBVERSION_SCRIPT_EXAMPLE_1.0;

vndk/tools/header-checker/tests/module.py

@@ -594,7 +594,7 @@ TEST_MODULES = [
         srcs=[
             'integration/weak_symbols/example.c',
         ],
-        version_script='integration/weak_symbols/libexample_old.map.txt',
+        version_script='integration/weak_symbols/old_map.txt',
         export_include_dirs=[],
         dumper_flags=['-output-format', 'Json'],
         linker_flags=[
@@ -609,7 +609,7 @@ TEST_MODULES = [
         srcs=[
             'integration/weak_symbols/example.c',
         ],
-        version_script='integration/weak_symbols/libexample_new.map.txt',
+        version_script='integration/weak_symbols/new_map.txt',
         export_include_dirs=[],
         dumper_flags=['-output-format', 'Json'],
         linker_flags=[