patch 9.1.1030: filetype: setting bash filetype is backwards incompatible

Problem:  filetype: setting bash filetype is backwards incompatible
Solution: revert patch v9.1.0965, detect bash scripts again as sh
          filetype

This reverts commit b9b762c21f2b61e0e7d8fee43d4d3dc8ecffd721.

related: #16309

Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/runtime/doc/version9.txt b/runtime/doc/version9.txt
index ecdb555..6cbd102 100644
--- a/runtime/doc/version9.txt
+++ b/runtime/doc/version9.txt
@@ -1,4 +1,4 @@
-*version9.txt*  For Vim version 9.1.  Last change: 2025 Jan 16
+*version9.txt*  For Vim version 9.1.  Last change: 2025 Jan 18
 
 
 		  VIM REFERENCE MANUAL    by Bram Moolenaar
@@ -41617,8 +41617,6 @@
   |CompleteDone| autocommand in the |v:event| dictionary
 - the default fontsize for the GTK builds of Vim (Windows and Unix) has been
   increased to 12pt to accomodate modern high-dpi monitors
-- filetype detection now detects bash scripts as a separate "bash" filetype
-  instead of the "sh" filetype
 - the default value of the 'keyprotocol' option has been updated by support
   for the ghostty terminal emulator (using kitty protocol)
 - |complete_info()| returns the list of matches shown in the poppu menu via