Fix path for main/debug_gdb_scripts.c in .gitattributes

The previous path `main/gdb_inlined_script.c` never existed in any commit
merged to master.

see 46b6ad6

Author: TimWolla

.gitattributes

@@ -21,7 +21,7 @@
 
 # Collapse generated files within git and pull request diff.
 **/*_arginfo.h linguist-generated -diff
-/main/gdb_inlined_script.c linguist-generated -diff
+/main/debug_gdb_scripts.c linguist-generated -diff
 /Zend/zend_vm_execute.h linguist-generated -diff
 /Zend/zend_vm_handlers.h linguist-generated -diff
 /Zend/zend_vm_opcodes.[ch] linguist-generated -diff