runtime(tiasm): use correct syntax name tiasm in syntax script

closes: #16416

Signed-off-by: Wu, Zhenyu <[email protected]>
Signed-off-by: Christian Brabandt <[email protected]>

Author: Freed-Wu

runtime/syntax/tiasm.vim

@@ -99,4 +99,4 @@ hi def link tiasmIdentifier	Identifier
 hi def link tiasmType		Type
 hi def link tiasmFunction	Function
 
-let b:current_syntax = "lineartiasm"
+let b:current_syntax = "tiasm"