Give more priority to declarations from the same file

idea/testData/completion/weighers/LocalFileBeforeImported.Data.kt

@@ -0,0 +1,5 @@
+package some
+
+fun foo() = 12
+fun fooImported() = 12
+fun fooNotImported() = 12

idea/testData/completion/weighers/LocalFileBeforeImported.kt

@@ -0,0 +1,12 @@
+import some.fooImported
+
+val fooVar = 12
+fun fooLocal() = 12
+
+val some = foo<caret>
+
+// "foo" is before other elements because of exact prefix match
+
+// ORDER: foo, fooLocal, fooVar, fooImported, fooNotImported
+// NUMBER: 2
+// SELECTED: 1