Pointer sensitivity: Adjust base gain range

This CL updates the `calculateBaseGain` function to use a base gain range of [1.0, 2.5]
instead of [0.5, 1.5]. This change ensures that the pointer movement is more responsive to
changes in sensitivity.

Bug: b/384552392
Test: Manual
Flag: com.android.hardware.input.pointer_acceleration
Change-Id: I5db7b1473fd5b6869f02fc4ef7aa1458a0df6f58

Author: Michael Checo

libs/input/AccelerationCurve.cpp

@@ -47,9 +47,9 @@ constexpr std::array<double, 15> kSensitivityFactors = {1,  2,  4,  6,  7,  8,
 // in faster pointer movements.
 //
 // The base gain is calculated using a linear mapping function that maps the
-// sensitivity range [-7, 7] to a base gain range [0.5, 2.0].
+// sensitivity range [-7, 7] to a base gain range [1.0, 3.5].
 double calculateBaseGain(int32_t sensitivity) {
-    return 0.5 + (sensitivity + 7) * (2.0 - 0.5) / (7 + 7);
+    return 1.0 + (sensitivity + 7) * (3.5 - 1.0) / (7 + 7);
 }
 
 } // namespace