negative speed fix

negative speed states wouldn't play the animation if it didn't have transition duration or exit time.
this PR fixes it by taking into account the speed multiplier when evaluating if the animation still has frames to play.

Diffs=
0bc446fad negative speed fix (#6982)

Co-authored-by: hernan <hernan@rive.app>

.rive_head

diff --git a/.rive_head b/.rive_head
index 2928304..ed40a47 100644
--- a/.rive_head
+++ b/.rive_head
@@ -1 +1 @@
-f832e26172cfbd11d52114ebb667e13418a5b1cd
+0bc446fad2a568a7088fdaa122af0de2de1dc940

include/rive/animation/linear_animation_instance.hpp

diff --git a/include/rive/animation/linear_animation_instance.hpp b/include/rive/animation/linear_animation_instance.hpp
index a7cb9f6..4919bd7 100644
--- a/include/rive/animation/linear_animation_instance.hpp
+++ b/include/rive/animation/linear_animation_instance.hpp
@@ -69,6 +69,13 @@
                (directedSpeed() < 0 && m_time > m_animation->startSeconds());
     }
 
+    bool keepGoing(float speedMultiplier) const
+    {
+        return this->loopValue() != static_cast<int>(rive::Loop::oneShot) ||
+               (directedSpeed() * speedMultiplier > 0 && m_time < m_animation->endSeconds()) ||
+               (directedSpeed() * speedMultiplier < 0 && m_time > m_animation->startSeconds());
+    }
+
     float totalTime() const { return m_totalTime; }
     float lastTotalTime() const { return m_lastTotalTime; }
     float spilledTime() const { return m_spilledTime; }

src/animation/linear_animation_instance.cpp

diff --git a/src/animation/linear_animation_instance.cpp b/src/animation/linear_animation_instance.cpp
index 7e132d4..ff7fe55 100644
--- a/src/animation/linear_animation_instance.cpp
+++ b/src/animation/linear_animation_instance.cpp
@@ -58,7 +58,7 @@
     // NOTE:
     // do not track spilled time, if our one shot loop is already completed.
     // stop gap before we move spilled tracking into state machine logic.
-    bool killSpilledTime = !this->keepGoing();
+    bool killSpilledTime = !this->keepGoing(elapsedSeconds);
 
     float lastTime = m_time;
     m_time += deltaSeconds;
@@ -165,7 +165,7 @@
     }
 
     m_didLoop = didLoop;
-    return this->keepGoing();
+    return this->keepGoing(elapsedSeconds);
 }
 
 void LinearAnimationInstance::time(float value)