[lang] SelectWordHandler: prefer element on the left if we are at the end of existing selection

Fixes IDEA-339055 `Extend selection` doesn't select qualifier of string templates properly

GitOrigin-RevId: 5008dfa9a1f448feda4c588362bde4e16fe6a810

java/java-tests/testData/codeInsight/selectWordAction/stringTemplate7/before.java

@@ -0,0 +1,8 @@
+class Test {
+  void test() {
+    int i = 1;
+    String sql = STR.<selection>"""
+                select * from customer \{i}
+                """<caret></selection>;
+  }
+}