libstdc++: Rename tests [PR12048]

These have the wrong PR number in the filenames.

libstdc++-v3/ChangeLog:

	PR libstdc++/12048
	* testsuite/ext/stdio_sync_filebuf/wchar_t/12948-1.cc: Move to...
	* testsuite/ext/stdio_sync_filebuf/wchar_t/12048-1.cc: ...here.
	* testsuite/ext/stdio_sync_filebuf/wchar_t/12948-2.cc: Move to...
	* testsuite/ext/stdio_sync_filebuf/wchar_t/12048-2.cc: ...here.
	* testsuite/ext/stdio_sync_filebuf/wchar_t/12948-3.cc: Move to...
	* testsuite/ext/stdio_sync_filebuf/wchar_t/12048-3.cc: ...here.
	* testsuite/ext/stdio_sync_filebuf/wchar_t/12948-4.cc: Move to...
	* testsuite/ext/stdio_sync_filebuf/wchar_t/12048-4.cc: ...here.

diff --git a/libstdc++-v3/testsuite/ext/stdio_sync_filebuf/wchar_t/12948-1.cc b/libstdc++-v3/testsuite/ext/stdio_sync_filebuf/wchar_t/12048-1.cc
similarity index 100%
rename from libstdc++-v3/testsuite/ext/stdio_sync_filebuf/wchar_t/12948-1.cc
rename to libstdc++-v3/testsuite/ext/stdio_sync_filebuf/wchar_t/12048-1.cc

diff --git a/libstdc++-v3/testsuite/ext/stdio_sync_filebuf/wchar_t/12948-2.cc b/libstdc++-v3/testsuite/ext/stdio_sync_filebuf/wchar_t/12048-2.cc
similarity index 100%
rename from libstdc++-v3/testsuite/ext/stdio_sync_filebuf/wchar_t/12948-2.cc
rename to libstdc++-v3/testsuite/ext/stdio_sync_filebuf/wchar_t/12048-2.cc

diff --git a/libstdc++-v3/testsuite/ext/stdio_sync_filebuf/wchar_t/12948-3.cc b/libstdc++-v3/testsuite/ext/stdio_sync_filebuf/wchar_t/12048-3.cc
similarity index 100%
rename from libstdc++-v3/testsuite/ext/stdio_sync_filebuf/wchar_t/12948-3.cc
rename to libstdc++-v3/testsuite/ext/stdio_sync_filebuf/wchar_t/12048-3.cc

diff --git a/libstdc++-v3/testsuite/ext/stdio_sync_filebuf/wchar_t/12948-4.cc b/libstdc++-v3/testsuite/ext/stdio_sync_filebuf/wchar_t/12048-4.cc
similarity index 100%
rename from libstdc++-v3/testsuite/ext/stdio_sync_filebuf/wchar_t/12948-4.cc
rename to libstdc++-v3/testsuite/ext/stdio_sync_filebuf/wchar_t/12048-4.cc