Detect multi-statement lines in else removal (#9748)

The condition here wasn't quite right -- we can have multiple
statements, all on the same line.

Closes https://github.com/astral-sh/ruff/issues/9732.

crates/ruff_linter/resources/test/fixtures/flake8_return/RET505.py

@@ -192,3 +192,9 @@ elif x == 2:
     y = "b"
 else:
     y = "c"
+
+
+# Regression test for: https://github.com/astral-sh/ruff/issues/9732
+def sb(self):
+    if self._sb is not None: return self._sb
+    else: self._sb = '\033[01;%dm'; self._sa = '\033[0;0m';

crates/ruff_linter/src/rules/flake8_return/rules/function.rs

@@ -820,8 +820,8 @@ fn remove_else(
 
         // If the statement is on the same line as the `else`, just remove the `else: `.
         // Ex) `else: return True` -> `return True`
-        if let [first] = elif_else.body.as_slice() {
+        if let Some(first) = elif_else.body.first() {
-            if indexer.in_multi_statement_line(first, locator) {
+            if indexer.preceded_by_multi_statement_line(first, locator) {
                 return Ok(Fix::safe_edit(Edit::deletion(
                     elif_else.start(),
                     first.start(),

crates/ruff_linter/src/rules/flake8_return/snapshots/ruff_linter__rules__flake8_return__tests__RET505_RET505.py.snap

@@ -162,4 +162,13 @@ RET505.py:183:5: RET505 Unnecessary `else` after `return` statement
     |
     = help: Remove unnecessary `else`
 
+RET505.py:200:5: RET505 Unnecessary `else` after `return` statement
+    |
+198 | def sb(self):
+199 |     if self._sb is not None: return self._sb
+200 |     else: self._sb = '\033[01;%dm'; self._sa = '\033[0;0m';
+    |     ^^^^ RET505
+    |
+    = help: Remove unnecessary `else`
+
 

crates/ruff_linter/src/rules/flake8_return/snapshots/ruff_linter__rules__flake8_return__tests__preview__RET505_RET505.py.snap

@@ -343,4 +343,20 @@ RET505.py:183:5: RET505 [*] Unnecessary `else` after `return` statement
 186 185 | 
 187 186 | x = 0
 
+RET505.py:200:5: RET505 [*] Unnecessary `else` after `return` statement
+    |
+198 | def sb(self):
+199 |     if self._sb is not None: return self._sb
+200 |     else: self._sb = '\033[01;%dm'; self._sa = '\033[0;0m';
+    |     ^^^^ RET505
+    |
+    = help: Remove unnecessary `else`
+
+ℹ Safe fix
+197 197 | # Regression test for: https://github.com/astral-sh/ruff/issues/9732
+198 198 | def sb(self):
+199 199 |     if self._sb is not None: return self._sb
+200     |-    else: self._sb = '\033[01;%dm'; self._sa = '\033[0;0m';
+    200 |+    self._sb = '\033[01;%dm'; self._sa = '\033[0;0m';
+