build: enable lintlua for src/ dir #26395

Problem:
Not all Lua code is checked by stylua. Automating code-style is an
important mechanism for reducing time spent on accidental
(non-essential) complexity.

Solution:
- Enable lintlua for `src/` directory.

followup to 517f0cc634

src/nvim/eval.lua

@@ -2114,7 +2114,7 @@ M.funcs = {
     name = 'execute',
     params = {
       { 'command', 'string|string[]' },
-      { 'silent', "''|'silent'|'silent!'" }
+      { 'silent', "''|'silent'|'silent!'" },
     },
     returns = 'string',
     signature = 'execute({command} [, {silent}])',
@@ -4519,7 +4519,7 @@ M.funcs = {
     name = 'getwininfo',
     params = { { 'winid', 'integer' } },
     signature = 'getwininfo([{winid}])',
-    returns = 'vim.fn.getwininfo.ret.item[]'
+    returns = 'vim.fn.getwininfo.ret.item[]',
   },
   getwinpos = {
     args = { 0, 1 },
@@ -6297,7 +6297,7 @@ M.funcs = {
     ]],
     name = 'maplist',
     params = {},
-    signature = 'maplist([{abbr}])'
+    signature = 'maplist([{abbr}])',
   },
   mapnew = {
     args = 2,
@@ -9905,7 +9905,7 @@ M.funcs = {
     name = 'sign_jump',
     params = { { 'id', 'integer' }, { 'group', 'string' }, { 'buf', 'integer|string' } },
     signature = 'sign_jump({id}, {group}, {buf})',
-    returns = 'integer'
+    returns = 'integer',
   },
   sign_place = {
     args = { 4, 5 },
@@ -9968,7 +9968,7 @@ M.funcs = {
       { 'dict', 'vim.fn.sign_place.dict' },
     },
     signature = 'sign_place({id}, {group}, {name}, {buf} [, {dict}])',
-    returns = 'integer'
+    returns = 'integer',
   },
   sign_placelist = {
     args = 1,
@@ -10035,7 +10035,7 @@ M.funcs = {
     name = 'sign_placelist',
     params = { { 'list', 'vim.fn.sign_placelist.list.item[]' } },
     signature = 'sign_placelist({list})',
-    returns = 'integer[]'
+    returns = 'integer[]',
   },
   sign_undefine = {
     args = { 0, 1 },
@@ -10570,7 +10570,7 @@ M.funcs = {
     signature = 'stdpath({what})',
   },
   state = {
-    args = {0, 1},
+    args = { 0, 1 },
     base = 1,
     desc = [=[
       Return a string which contains characters indicating the
@@ -12698,7 +12698,7 @@ M.funcs = {
     name = 'winsaveview',
     params = {},
     signature = 'winsaveview()',
-    returns = 'vim.fn.winsaveview.ret'
+    returns = 'vim.fn.winsaveview.ret',
   },
   winwidth = {
     args = 1,