[LyX/master] Fix Python SyntaxWarning

[Scott Kostyshak]

commit 72f4acf66ca899862a0549d7477ea9c25632a7c0
Author: Scott Kostyshak <skostysh at lyx.org>
Date:   Thu Aug 22 10:51:09 2024 -0400

    Fix Python SyntaxWarning
    
    Use raw strings to avoid the following syntax warnings that show up
    in LastTest.log after running tex2lyx ctests:
    
      src/tex2lyx/test/runtests.py:135: SyntaxWarning: invalid escape sequence '\o'
        if linex[:-1] == '\origin ' + inputdir + '/':
      src/tex2lyx/test/runtests.py:136: SyntaxWarning: invalid escape sequence '\o'
        lines1[i1] = '\origin ' + outputdir + '/' + "\n"
---
 src/tex2lyx/test/runtests.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/tex2lyx/test/runtests.py b/src/tex2lyx/test/runtests.py
index aae80c1426..696123958d 100755
--- a/src/tex2lyx/test/runtests.py
+++ b/src/tex2lyx/test/runtests.py
@@ -132,8 +132,8 @@ def main(argv):
                     lines1 = f1.readlines()
                     i1 = 0
                     for linex in lines1:
-                      if linex[:-1] == '\origin ' + inputdir + '/':
-                        lines1[i1] = '\origin ' + outputdir + '/' + "\n"
+                      if linex[:-1] == r'\origin ' + inputdir + '/':
+                        lines1[i1] = r'\origin ' + outputdir + '/' + "\n"
                         break
                       i1 = i1+1
                     lines2 = f2.readlines()